Sex-Related Terms

A lot of manga and anime feature sex-related jokes, or dirty jokes, "low jokes," shimoneta 下ネタ, besides those that are simply sexual in nature, like of the ecchi and hentai genres. So, for reference, a list of sex-related Japanese vocabulary.

• Anatomy
• Colloquialisms
  
  • Breasts
  • Butt
  • Penis
  • Vagina
  • Censoring
  • Other Terms
• Menstruation
• Erection
• Fluids
  
  • Pee
  • Semen
  • Vaginal Discharge
• Masturbation
  
  • オカズ
• Ejaculation
• Sex
  
  • セックス
  • Sex-Related Terms
  • Sex Positions
  • Sex Toys
  • Orgasm
  • Virginity
  • Conception
  • フェラチオ
  • 姦
  • レイプ
• Counting
• Graffiti
• Abbreviations

Anatomy

Let's start with the technical terms for sex-related anatomy. This is mostly the NSFW continuation of the full article about Body Parts.

The words for the genitalia in Japanese:

• seiki 性器
  Sex organ.
  • sei- 性～
    Sexual.
  • -ki ～器
    Organ. Device. Instrument.
• danseiki 男性器
  Male sex organ.
  • dansei 男性
    Male. Men.
• joseiki 女性器
  Female sex organ.
  • josei 女性
    Female. Women.
• naiseiki 内性器
  Internal sex organ.
• gaiseiki 外性器
  External sex organ.
• seishoku 生殖
  Reproduction.
• seishokuki 生殖器
  Reproductive organ. Genital.
• inbu 陰部
  Genital area.
  • in 陰 means "unseen" and bu 部 means "part." So the term is literally "private parts."

Parts of the male sexual organ:

• inkei 陰茎
  Penis.
  • Also referred to by the katakanization:
  • penisu ペニス
    "Penis."
• kitou 亀頭
  inkei kitou 陰茎亀頭
  Glans. Glans penis.
• kari-kubi カリ首
  kari カリ
  inkei kitoukan 陰茎亀頭冠
  inkei kitoukou 陰茎亀頭溝
  Penis crown. Corona of glans penis.
• inkei houhi 陰茎包皮
  houhi 包皮
  Foreskin. (male only.)
  Prepuce. (both sexes.)
  • hifu 皮膚
    Skin.
  • kawa 皮
    Skin. Hide. Pelt.
• inkei shoutai 陰茎小帯
  Penile frenulum.
• inkei kyaku 陰茎脚
  Crus of penis.
  • Since ashi 脚 means "legs," this is literally the "penis' legs."
• inkei wana jintai 陰茎ワナ靭帯
  Fundiform ligament of the penis.
• seinou 精嚢
  Seminal vesicle. Seminal glands.
• shaseikan 射精管
  Ejaculatory duct.
• zenritsusen 前立腺
  Prostate gland.
  • "Prostate" comes from "pro histanai" in Latin, which means "to stand," tatsu 立つ, "before," mae 前.^{[Etymology of Abdominal Visceral Terms]}
• nyoudou kyuusen 尿道球腺
  kaupaasen カウパー腺
  Bulbourethral gland. "Cowper's gland​." "Urine path ball gland."
• seikan 精管
  yuseikan 輸精管
  Seminal duct. Vas deferens. Ductus deferens.
• seikan boudaibu 精管膨大部
  Ampulla of ductus deferens.
• seisou 精巣
  Testicle.
  • Contrary to popular belief, semen isn't stored in the testicles.
  • Sperm is stored in the testicles.
  • Semen is 5% sperm, 95% other stuff.
  • Pee isn't stored in the testicles either.
• kougan 睾丸
  Testicle.
  • Another term for testicle.
  • Note that maru 丸 means "round," while su 巣 means "nest," so you could say one comes from its form and the other from its function. So, for example, toward animals whose testicles don't resemble balls, kougan wouldn't be used.
• in'nou 陰嚢
  Scrotum.
• seisou shouyou 精巣小葉
  Lobules of testis.
• seisoumou 精巣網
  Rete testis.
• seisou joutai 精巣上体
  Epididymis.
• seisou yushutsukan 精巣輸出管
  Efferent ducts.
• seisaikan 精細管
  Seminiferous tubule.
• chuujinkan 中腎管
  whorufukan ウォルフ管
  Mesonephric duct. "Walffian duct"

Parts of the female sexual organ:

• gaiinbu 外陰部
  gaiin 外陰
  "External genital area." Vulva.
  • baruba バルバ
    varuva ヴァルヴァ
    "Vulva." (generally not used.)
• inretsu 陰裂
  Pudendal cleft.
• inkaku 陰核
  intei 陰梃
  Clitoris.
  • kuritorisu クリトリス
    "Clitoris."
  • inkaku houhi 陰核包皮
    Clitoral hood. "Clitoral prepuce."
  • inkaku kitou 陰核亀頭
    Clitoral glans.
  • inkaku shoutai 陰核小帯
    Clitoral frenulum.
• inshin 陰唇
  Labia.
  • shouinshin 小陰唇
    Labia minora.
  • daiinshin 大陰唇
    Labia majora.
• zenteikyuu 前庭球
  Vestibular bulb. Clitoral bulbs
• inkakukyaku 陰核脚
  Crus of clitoris. "Clitoris' legs."
• chitsu 膣
  shitsu 腟
  Vagina.
  • The "vagina" is an internal tube connecting the uterus to the outside of the body.
  • In English, a lot of people use the term "vagina" to refer to the vulva, which is technically not the same thing as the vagina.
  • vagina ヴァギナ
    wagina ワギナ
    "Vagina."
• chitsukou 膣口
  Ostium of the vagina. "Vaginal opening."
• shojomaku 処女膜
  Hymen.
  • The word shojo 処女 means a female "virgin," and maku 膜 means a "membrane." So this term means literally "virgin membrane."
  • Despite popular belief held in dozens of countries worldwide and through history, a virgin doesn't necessarily have an intact hymen: it can tear and rip apart for countless reasons.
  • Of course 21st century Japanese doctors know this.
  • Even so, shojomaku is still the formal term for "hymen" in Japanese. It's not a slang.
  • By the way, "hymen" comes from the Greek humēn, which means "membrane," and has nothing to do with virgins.
• chitsuengai 膣円蓋
  Vaginal fornix.
• shikyuu 子宮
  Uterus. Womb.
  • For the "womb tattoo" trope, see inmon 淫紋, "lewd crest."
• shikyuukei 子宮頸 (or 子宮頚)
  shikyuukeibu 子宮頸部 (or 子宮頚部)
  Cervix. Cervix uteri. "Uterus neck (region)."
  • gaishikyuukou 外子宮口
    External os. "External uterine orifice."
  • nashikyuukou 内子宮口
    Internal os. "Internal uterine orifice."
  • shikyuu chitsubu 子宮腟部
    Vaginal portion of the cervix. Ectocervix.
• shikyuutai 子宮体
  Corpus. "Body of the uterus."
  • shikyuukuu 子宮腔
    Uterine cavity.
  • shikyuutei 子宮底
    Fundus. "Bottom of the uterus." (this is actually at the top of the uterus, in the same sense the "bottom" of the barrel is actually at the top of the barrel if it's upside-down.)
• shikyuuheki 子宮壁
  shikyuu no kabe 子宮の壁
  Uterine wall.
  • shikyuu naimaku 子宮内膜
    Endometrium. "Uterus internal membrane."
  • shikyuu kinsou 子宮筋層
    Myometrium. "Uterus muscle layer."
  • shikyuu shoumaku 子宮漿膜
    shikyuu gaimaku 子宮外膜
    Perimetrium. "Uterus serous/external membrane."
• yurankan 輸卵管
  rankan 卵管
  Fallopian tube. "Oviducts." Uterine tubes. Salpinges.
  • rankou boudaibu 卵管膨大部
    Ampulla of the uterine tube.
  • rankan routo 卵管漏斗
    Infundibulum of the uterine tube.
  • rankansai 卵管采
    Fimbria of the uterine tube.
• ransou 卵巣
  Ovary.
• jii-supotto Ｇスポット
  G-spot. Gräfenberg spot.
• buroturinsen バルトリン腺
  Bartholin's gland. Greater vestibular glands.
• sukiinsen スキーン腺
  shouzenteisen 小前庭腺
  bounyoudousen 傍尿道腺
  Skene's gland

Shared anatomy:

• nyoudou 尿道
  Urethra.
  • Literally "urine," nyou 尿, "path," michi 道.
• nyoudoukou 尿道口
  "Urethral opening." External urethral orifice. Urinary meatus.
• boukou 膀胱
  Urinary bladder.
• kaimentai 海綿体
  Corpus cavernosum.
  Corpus spongiosum. "Sponge body."
• shoutai 小帯
  Frenulum. "Small band."

Nearby anatomy:

• kokan 股間
  mata 股
  Crotch.
• inmou 陰毛
  chimou 恥毛
  Pubic hair.
• seimou 性毛
  Body hair. "Sex hair." (hair that develops after puberty.)
  Androgenic hair. (from androgen, the hormone.)
• shiri 尻
  denbu 臀部
  Buttocks.
  • oshiri お尻
    Buttocks.^{(polite prefix.)}
• ein 会陰
  Perineum.
• chikyuu 恥丘
  viinasu no oka ヴィーナスの丘
  Pubic mound. Mons pubis.
  Mons Venus. "Mound of Venus."
  • Pudendum originates in a Latin word for "shame," which is haji 恥 in Japanese. Usually in the sense of "cover your shame."^{[Etymology of Abdominal Visceral Terms]}
• koumon 肛門
  Anus.
  • koumon katsuyaku-kin 肛門括約筋
    Anal sphincter. (muscle.)
• chokuchou 直腸
  Rectum.
• esu-jou kecchou Ｓ状結腸
  esu-ji kecchou Ｓ字結腸
  Sigmoid colon. "S-shaped" colon. "S-letter" colon.

Not nearby, but relevant nonetheless:

• mune 胸
  Chest.
• chibusa 乳房
  Breast.
• nyuurin 乳輪
  Areola.
• chikubi 乳首
  Nipple.
• nyuutou 乳頭
  Teat.

Colloquialisms

Japanese, like any other language in the world, also has a number of non-technical terms, colloquialisms, slangs, metonyms, vulgar words, and profanities that refer to body parts, specially the genitals.

• zokugo 俗語
  Colloquialism. Slang.
• ingo 隠語
  Jargon. Slang.
• higo 卑語
  Swear words.
• surangu スラング
  Slang.

The most important of such words are the ones that actually have some completely normal and innocent meaning, since those are the ones found in most dirty jokes in anime.

Let's start with the most basic words:

• asoko あそこ
  "There." May refer to the genital area, down there, private parts, etc.

• nyoudou 尿道
  Urethra. "Urine path." (technical.)
  • nyou 尿
    Urine.
• oshikko no ana おしっこの穴
  "Pee hole."
  • oshikko おしっこ
    Pee.

Breasts

• chibusa 乳房
  Breasts. (technical.)
• mune 胸
  Chest.
• chichi 乳
  This word technically means "milk," but can also refer to "breasts."
• oppai おっぱい
  "Maternal milk," specifically in the sense of breastfeeding babies, but can also mean "breasts," "boobs," "tits," etc.
• dekapai デカパイ
  kyonyuu 巨乳
  bakunyuu 爆乳
  Large breasts.
• chippai チッパイ
  hin'nyuu 貧乳
  binyuu 微乳
  Small breasts.
• sentakuita 洗濯板
  Washboard. (as in flat as a board.)
  • sentaku 洗濯
    Laundry.
  • The shape of a washboard resembles the ribs at the center of a flat chest.

Butt

• denbu 臀部
  Gluteal region. (technical.)
• shiri 尻
  oshiri お尻
  Butt.
• ketsu ケツ
  ketsu 穴
  ketsu 尻
  Ass.
  • Note:
  • ana 穴
    "Hole."
    (kun'yomi reading.)
  • ketsu 穴
    (on'yomi reading.)

• koumon 肛門
  Anus.
• shiriana 尻穴
  shiri no ana 尻の穴
  ketsumedo 尻穴
  "Butthole."
• ketsu ana ケツ穴
  ketsu no ana ケツの穴
  "Asshole."
  • In Gintama 銀魂, the name of the character Ketsuno Ana 結野アナ is a pun on the word for asshole in Japanese.
• anusu アヌス
  "Anus."
• anaru アナル
  "Anal." (e.g. sex.)
  Anus. (the body part.)
  • You read that right, in Japanese, "anal" also means "anus." Example:
  • anaru wa iriguchi janai
    アナルは入り口じゃない
    The anal isn't... (wrong.)
    The anus isn't an entrance. (it's an exit.)

• ari no towatari 蟻の門渡り
  towatari 門渡り
  Perineum.
  "The entrance-traversing of ants."
  • Because the perineum forms an ant-line-like line between one hole (genitals) and another (anus).
  • to 戸
    Door.
  • wataru 渡る
    To cross over. To traverse. (from one place to another.)

Penis

• inkei 陰茎
  Penis. (technical.)
• penisu ペニス
  "Penis."
• chinchin ちんちん (or チンチン)
  Penis. Wiener. (children's language.)
  • ochinchin おちんちん (or おチンチン)
    Penis.^{(polite prefix.)}
  • The word chinchin, without the o- prefix, also refers to a dog trick in which the dog puts its two front paws up plus a dozen other things.
• chinko チンコ
  ochinko おチンコ
  Penis. Dick. (vulgar.)
• chinpo チンポ
  ochinpo おチンポ
  Penis. Cock. (more vulgar.)
• chinbou ちんぼう
  chinpou ちんぽう
  chinboko ちんぼこ
  chinpoko ちんぽこ
  chinpokko ちんぼっこ
  Penis. (other variants.)

Also note this verb:

• tsuku 付く
  To attach. (literally)
  • To have [a penis] attached.
  • To have a penis.

Manga: Kaguya-sama wa Kokurasetai ~Tensai-Tachi no Ren'ai Zunousen~ かぐや様は告らせたい～天才たちの恋愛頭脳戦～ (Chapter 27)

• ano, sono
  あの　その
  (stuttering.)
• tsuiteru-n-desu ka?
  ついてるんですか？
  Is it attached?
  • Do you have a penis?

Vagina

• chitsu 膣
  Vagina. (technical.)
• nyoin 女陰 (or join)
  "Female genital." (some sources say this is the vulva, others that it's the vagina.)
• manko マンコ
  omanko おマンコ
  Vagina. Pussy. (vulgar.)
  • manko suru マンコする
    To have sex.
• omeko オメコ
  Vagina. Pussy. (used more in Kansai.)
• pusshii プッシー
  "Pussy."
  • Also children's language for "cat."
  • But wait, this is English, you knew that right?
• wareme 割れ目 (or ワレメ)
  Pudendal cleft. (slang.)
  • wareru 割れる
    To be parted, divided, split, cracked, etc.
  • wareme-chan ワレメちゃん
    (cutesy way of saying.)
• mekosuji メコスジ
  Camel toe.
  • omeko no suji オメコのスジ
    The suji of an omeko.
  • mansuji マンスジ
    (variant.)
  • suji スジ
    A "thin line." (besides dozens of other meanings.)
    Camel toe. (because of the line between the labia.)
  • The word mekosuji is sometimes abbreviated to just suji, and sometimes the adjective and noun switch places:
  • sujimeko スジメコ
    sujiman スジマン
    Camel toe vagina.

Sometimes, manko is attached to words for other body parts used in sexual intercourse. For example:

• ketsu-manko ケツマンコ
  Ass-pussy. (anal sex.)
  • Originally a gay slang.
• kuchi-manko 口マンコ
  Mouth-pussy. (oral sex.)
• nodo-manko 喉マンコ
  Throat-pussy. (deep-throating.)
• te-manko 手マンコ
  Hand-pussy. (handjob.)
• ashi-manko 足マンコ
  Foot-pussy. (footjob.)

Censoring

Sometimes, manko, chinko and chinpo can get censored in manga by replacing a kana with a circle ◯. In anime, it gets bleeped instead.

Generally speaking, manko is more likely to be censored because it can also mean "to have sex," manko suru, so it ends up being sexual, while chinko is only genital.

For reference:

• マ◯コ, マン◯, おマ◯コ, おマン◯
  ま◯こ, まん◯, おま◯こ, おまん◯
  manko, manko, omanko, omanko.
• チ◯コ, おチ◯コ
  ち◯こ, おち◯こ
  chinko, ochinko.
• ◯ンポ, チ◯ポ, お◯ンポ, おチ◯ポ
  ◯んぽ, ち◯ぽ, お◯んぽ, おち◯ぽ
  chinpo, chinpo, ochinpo, ochinpo.
• チン◯, おチン◯
  ちん◯, おちん◯
  chinko, ochinko, or chinpo, ochinpo.
• ◯んこ, お◯んこ
  ◯ンコ, お◯ンコ
  chinko, ochinko or manko, omanko.

Since chinchin, ochinchin is not considered vulgar—it's children's language—it's normally not censored, but for the sake of completeness:

• ◯んちん, ち◯ちん, ちん◯ん, ちんち◯
  ◯ンチン, チ◯チン, チン◯ン, チンチ◯
  chinchin, chinchin, chinchin, chinchin
• お◯んちん, おち◯ちん, おちん◯ん, おちんち◯
  お◯ンチン, おチ◯チン, おチン◯ン, おチンチ◯
  ochinchin, ochinchin, ochinchin, ochinchin

Other Terms

There are dozens of other colloquialisms, analogies and slangs for sexual body parts.

Let's start with the obvious ones for the testicles:

• tama 玉
  Balls. Ball. (literally.)
  • Also a common name for a pet cat: tama タマ, for dog it's pochi ポチ, "spot."
• kintama 金玉
  Golden balls.
  • In English, "jewels" are used similarly.
• tamatama タマタマ
  Balls. ^{(reduplicated plural.)}
  • Body terms featuring plurality by reduplication, otete お手手, omeme お目目, are normally used when talking to little children, babies, or in rare cases when someone is being condescending, treating someone else like a baby. In this case, it's because some adult women think tamatama is a cute-ish way of referring to the "balls" of an adult man.

For penis:

• sao 竿
  Stick. Pole.
• nikusao 肉竿
  Meat stick.
• bou 棒
  Stick. Pole.
• nikubou 肉棒
  Meat stick.

Some words that somehow also mean penis:

• musuko 息子
  gusoku 愚息
  segare 倅
  Son.
  • Yes, "son," as in, not a daughter. Like "my son" is an innuendo for "my penis."
• ichimotsu 一物
  "One thing."
  • That's what it means. "One thing."
  • Okay, it can also mean something you have "hidden," like in your chest, a secret, so maybe it comes from that meaning instead.
• mono モノ (or 物)
  "Thing." (just "thing," like, "his thing," etc.)

Some words that don't mean penis, but get compared a lot:

• kinoko キノコ (or 茸)
  Mushroom.
• banana バナナ
  Banana.
• sooseeji ソーセージ
  Sausage.
• uin'naa ウインナー
  Wiener.
• ottosei オットセイ
  Fur seal.
• zou 象
  Elephant. (because of the trunk.)
• manmosu マンモス
  Mammoth.

Anime: Shimoneta to Iu Gainen ga Sonzai Shinai Taikutsu na Sekai 下ネタという概念が存在しない退屈な世界 (Episode 2)

• A woman savoring a mushroom.

Manga: Kaguya-sama wa Kokurasetai ~Tensai-Tachi no Ren'ai Zunousen~ かぐや様は告らせたい～天才たちの恋愛頭脳戦～ (Chapter 27)

• meimei chinko
  命名　ちん子
  Name: Chinko.
  • ko 子
    A common suffix in names of girls. Yuuko 優子, Hanako 花子, etc.

There are even pairings like this mountainous one:

• matsutake 松茸
  Tricholoma matsutake, a mushroom.
  (male genital.)
• akebi アケビ
  Akebia quinata, the chocolate vine.
  (female genital.)
• [里のアケビは山のマツタケ見て開くってどういう意味ですか？ - detail.chiebukuro.yahoo.co.jp, accessed 2019-04-26]

Or this religious one:

• mara 魔羅
  In Buddhism, mara is a demon that tempted the Buddha with visions of seducing women.
  (male genital.)
• kan'non-sama 観音様
  Avalokiteśvara, the bodhisattva. Guanyin.
  (female genital.)

And of course, this militaristic one:

• katana 刀
  Sword. (penis)
• saya 鞘
  Scabbard. (vagina)
• The term "vagina" comes from Latin, in which it means "sheath" or the "scabbard" of a sword. Similarly, "gladius," which means "sword," was a term for penis.^{[Etymology of Abdominal Visceral Terms]}

Terms for the female genitalia:

• awabi 鮑
  Abalone. Ear shell. (from the shape of the vulva.)
• mitsutsubo 蜜壷
  "Honeypot." (vagina.)

Notably, specifically in regards to sex:

• meiki 名器
  Famed instrument/utensil. (an excellent vagina.)
  • Often in the sense of:
  • shimari ga ii 締まりがいい
    "The contraction is good."
    Good at contracting.
  • It can also mean "an excellent penis," apparently.

Specially because Japan has different weird terms for different types of "excellent vaginas," like:

• mimizu senbiki ミミズ千匹
  One thousand worms. (from the texture of the vaginal walls.)
• kazu-no-ko tenjou 数の子天井
  Ceiling of herring roe. (from the texture of the superior vaginal wall in missionary position.)
  • zarame ザラメ
    (synonym.)
  • kazu no ko 数の子
    Herring roe.
• takotsubo タコツボ (or 蛸壺)
  Octopus pot. (a vagina which tightens on penetration.)
  • Octopus pots are pots used to capture octopuses, by the way. They're placed horizontally on the sea floor, and octopuses get into them because they like to hide and there aren't many places to hide into on the sea floor.
• kinchaku 巾着
  Drawstring pouch. (a vagina that tightens entirely.)

Colloquialisms for the "clitoris," kuritorisu クリトリス, include:

• kuri クリ
  Clit. Clitoris. (abbreviation)
  • kuri 栗
    Chestnut. (also means clitoris because it's a homonym.)
  • kuri to risu 栗と栗鼠
    Chestnut and squirrel. (only means clitoris if it's a pun.)
  • kurichan クリちゃん
  • maron マロン
    Marron. Culinary name for chestnut. (also slang for clitoris.)
• kurikuri クリクリ
  • okurikuri オクリクリ
• kuritto クリット
  "Clit.
• mame 豆
  "Bean."
  • omame お豆
  • mamesan 豆さん
  • omamesan お豆さん
• chikaku 恥核
  "Shame core." (core as in the solid center of something, the pit of a fruit, etc.)
• nyoshin 女芯
  "Female core." (core as in the center of something.)
• kashin 花芯
  "Flower core." (i.e. pistils and stamens.)

Other terms about the female genitalia:

• hanabira 花びら
  Flower petals. (labia minora.)
  • birabira ビラビラ
    (labia.)

• poruchio ポルチオ
  "Portio" uteri. (ectocervix.)

Terms for the Mons pubis:

• inpu 陰阜 (or inbu, infu)
  Mons pubis.
• deruta デルタ
  "Delta." Mon pubis.
  • deruta chitai デルタ地帯
    "Delta zone." River delta.
  • A river delta is a landform created by sediment carried by a river toward stagnant water (e.g. a lake, sea, ocean.)
  • It's called "delta" because it's often shaped like a triangle, which's the shape of the Greek letter delta Δ.
  • Colloquially, when a girl wearing a mini-skirt sits on a chair, with her knees facing to you, the space toward her crotch between her thighs and skirt which forms an inverted triangle may be called "delta" in Japanese. ^{[デルタ - ja.wikipedia.org, accessed 2019-04-26.]}
  • And, similarly, the Mons pubis, which's on the crotch, is also called delta.
• dote 土手
  "Embankment."
  • A bank of earth built to stop water, wind.
  • Since this "bank" is an elevated mound of earth, it ends up referring to the pubic mound too.
  • doteman ドテマン
• moriman モリマン
  From moriagaru 盛り上がる, "to swell," "to bulge."

Other slangs for body parts:

Anime: Shimoneta to Iu Gainen ga Sonzai Shinai Taikutsu na Sekai 下ネタという概念が存在しない退屈な世界 (Episode 1)

• biichiku Ｂ地区
  "District B."
  Nipple. (because it's chikubi.)

With adjectives:

• kyokon 巨根
  dekachin デカチン
  dekamara デカマラ
  kyochin 巨チン
  Large penis.
  • dekai デカイ
    Big.
• tanshou 短小
  "Short and small."
  • mijikai 短い
    Short.
  • chiisai 小さい
    Small.
• sochin 粗チン
  Small penis.
  • somatsu 粗末
    Poor. Shabby.
• yuruman ユルマン
  Loose vagina.
  • yurui 緩い
    Loose.
• kitsuman キツマン
  Tight vagina.
  • kitsui きつい
    Tight.

Other related terms

• paipan パイパン
  Having no pubic hair. (usually female.)
  • This term comes from Mahjong. (yes, really.)
  • In Japanese, the white dragon tile is called paipan 白板, pai means white, pan means board, so "whiteboard." That's not the normal reading of the kanji. The term is probably loaned from Chinese.
• chinge ちん毛
  (male) pubic hair. "Penis hair."
• mange マン毛
  (female) pubic hair. "Vagina hair."
• kemeko 毛めこ
  Hairy vagina.
• houkei 包茎
  Phimosis.
• kyosei 去勢
  Castration.
  • Similar words:
  • kyousei 共生
    Living together.
  • kyousei-teki ni 強制的に
    Forcibly.

Menstruation

Menstruation, or period, is a thing that occurs periodically, like, per month, which in Latin is "mensis," which is also more or less how periodically the Moon goes around the Earth.

• gekkei 月経
  Menstruation. (technical.)
  • getsu 月
    Month.
  • tsuki 月
    Moon.
  • tatsu 経つ
    (for time) to pass.
  • gekkei-zen shoukougun 月経前症候群
    "Premenstrual Syndrome." PMS.
• shochou 初潮
  shokei 初経
  First menstruation. Menarche.

Colloquially, it's also called:

• seiri 生理
  Physiology.
  Menstruation.
  • seiri-tsuu 生理痛
    Menstrual pain.
  • seiri-kikan 生理期間
    Menstrual interval.
  • seiribi 生理日
    Menstrual days.
  • seiri genshou 生理現象
    Physiological phenomenon.
• mensu メンス
  "Mens." (German word for menstruation.)
• onna no ko no hi 女の子の日
  Girl's day. Girl's days.

It's also called in some particularly ambiguous ways:

• ano hi あの日
  That day. Those days.
• are アレ
  That.
  • It's like Demiurge picked this.

As for the products for menstruation:

• tanpon タンポン
  Tampon.
  • apurikeetaa アプリケーター
    Applicator.
• napukin ナプキン
  "Napkin." (yes, just napkin.)
  Pad. Menstrual pad. Sanitary pad. Sanitary towel. Sanitary napkin.
• gekkei kappu 月経カップ
  Menstrual cup.

Anime: Oshiete! Galko-chan おしえて! ギャル子ちゃん (Episode 2)

• napukin-ha wa shojo,
  tanpon-ha wa hishojo tte
  hontou desu ka?
  ナプキン派は処女、
  タンポン派は非処女って
  本当ですか？
  Is it true that
  [those that prefer] pads are virgins,
  [those that prefer] tampons are non-virgins?
  • ha 派
    Having preference for [something]. (suffix.)

Erection

The word for erection in Japanese is:

• bokki 勃起
  Erection.
  • Normally refers to the penis, but can also be clitoris, nipples.
  • Doesn't mean the "erection" a building.
• bokki suru 勃起する
  To get erect.
• tatsu 立つ
  To stand up. (general term.)
  • Sometimes spelled with ateji from the kanji of bokki 勃起.
  • tatsu 勃つ
    To stand erected.
    (for a penis) to be erect.
  • tatsu 起つ
    To rise up. (politically.)
    To get erect. (sexually.)

Related terms include:

• tento wo haru テントを張る
  To put up a tent. (like in camping.)
  • Also to have an erection while wearing pants, because of the tent-like shape it makes.
• yakan inkei bokki genshou 夜間陰茎勃起現象
  "Nocturnal Penis Erection Phenomenon."
  Nocturnal Penile Tumescence. NPT. (technical term.)
  • Also known as:
  • asadachi 朝立ち (or 朝勃ち, 朝起ち)
    Morning wood.
  • yorudachi 夜立ち (夜勃ち, 夜起ち)
    (if it happens at night.)
• bokki fuzen 勃起不全
  "Incomplete erection."
  Erectile dysfunction.
  • ee-dhii イーディー
    ED.
  • bokki kinou shougai 勃起機能障害
    bokki shougai 勃起障害
    "Erection function impediment."
  • in'i 陰萎
    Erectile impotence.
  • inpotentsu インポテンツ
    "Impotent."
  • inpo インポ
    (abbreviation, sometimes used derogatorily.)
  • inpo yarou!
    インポ野郎！
    You impotent bastard! (or something like that.)

Fluids

• ekitai 液体
  Fluid.
• taieki 体液
  Bodily fluid.
• nen'eki 粘液
  Mucus.

• seieki 性液
  Sexual fluid. (not a technical term, colloquialism.)

• chi 血
  Blood.
  
  • chi ga deru 血が出る
    Blood leaves.
    To bleed.
  • shukketsu 出血
    Bleeding.
  • ketsueki 血液
    Blood. (anatomical sense.)
• bonyuu 母乳
  Maternal milk.
  • bonyuu ga deru 母乳が出る
    (same idea.)

• chikou 恥垢
  Smegma. (technical.)
• chinkasu チンカス
  "Penis waste."
  • Sometimes used as a derogatory:
  • chikasu yarou!
    チンカス野郎！
    You smegma bastard! (what? This makes no sense in English.)
• kurikasu クリカス
  "Clitoris waste."
• mankasu マンカス
  "Vagina waste."

• toumei 透明
  Clear. Transparent.
• usui 薄い
  Thin. Watery.
• koi 濃い
  Thick. Dense.

Pee

• nyou 尿
  Urine. (technical.)
• shouben 小便
  Pee.
  • daiben 大便
    Poop.
  • In a way, the naming is similar to "number 1" and "number 2" in English, except it's "small" (小) and "big" (大) in Japanese.
• oshikko おしっこ
  shikko しっこ
  Pee. Piss.
  • In English there's a number of idioms involving the word "piss," like "piss off," "to be pissed," and so on that absolutely don't translate to the words for piss in Japanese.

• hainyou 排尿
  Urination. "Urine expelling."
• hounyou 放尿
  Urination. "Urine release."
• hainyou suru 排尿する
  hounyou suru 放尿する
  To urinate.
• oshikko suru おしっこする
  To pee.

• shikkin 失禁
  Incontinence. (technical.)
• omorashi お漏らし
  Incontinence. Wetting one's pants. (children's language)
  • morasu 漏らす
    To leak. (transitive.)

Semen

Semen is a liquid composed by sperm and other stuff.

• seieki 精液
  seisui 精水
  Semen.
  • seieki saishu 精液採取
    Semen collection.
• seishi 精子
  Sperm.
  • seishi banku 精子バンク
    Sperm bank.
• seishou 精漿
  Everything that's not sperm in the semen.
  • zenritsusen-eki 前立腺液
    Prostatic fluid.
  • seinou-bunpitsu-eki 精嚢分泌液
    Seminal vesicle secretion.
  • nyoudou-kyuusen-eki 尿道球腺液
    kaupaasen'eki カウパー腺液
    Pre-ejaculate. Cowper's fluid. "Cowper's gland fluid."

Note that a lot of people don't know the difference between the two and they will mistake "semen" for "sperm" and vice-versa, both in English and in Japanese.

• zaamen ザーメン
  Cum. "Semen."
  • A katakanization, but likely associated with pornography. ^{[ザーメンってなんですか？ - detail.chiebukuro.yahoo.co.jp, accessed 2019-04-25]}
• zaajiru ザー汁
  "Semen juice." (a lot of slangs have jiru 汁 in it.)

Slangs for "pre-cum," pre-ejaculate, include:

• kaupaa カウパー
  "Cowper." (fluid.)
• gaman-jiru 我慢汁
  "Endurance juice." "Patience-juice."
  • gaman suru 我慢する
    To endure. To have patience.

Semen is sometimes likened to white drinks, like:

• miruku ミルク
  Milk.
• yooguruto ヨーグルト
  Yogurt.
• kefia ケフィア
  Kefir.
• karupisu カルピス
  Calpis. (Japanese soft drink.)

By its smell:

• ika-kusai イカ臭い
  Squid smelling.
  • This analogy was brought to you by a country that eats a lot of seafood.

Vaginal Discharge

Vaginal discharge is also composed by a bunch of things.

• chitsu bunpitsueki 膣分泌液
  Vaginal discharge.
  • chitsu-eki 膣液
    Vaginal fluid.
• sukiinsen-eki スキーン腺液
  Skene's gland secretion.
• barutorinsen-eki バルトリン腺液
  Bartholin's gland secretion.
• shikyuukeikan nen'eki 子宮頚管粘液
  Cervical mucus. "Cervical canal mucus."

The amount of fluid discharged increases while sexually aroused.

• nureru 濡れる
  To get wet. (intransitive.)
  • nurasu 濡らす
    To wet. (transitive.)

There's a term specifically for vaginal discharge while not aroused:

• orimono オリモノ (or 下り物)
  "Falling thing." (normal vaginal discharge.)
  • Synonyms:
  • koshike こしけ
  • taige 帯下

Slangs include:

• aieki 愛液
  "Love fluid."
• manjiru マン汁
  "Pussy juice."
• rabu juusu ラブジュース
  "Love juice." (may also mean semen.)

Masturbation

• jii 自慰
  jidoku 自涜
  Masturbation.
• jibun wo nagusameru 自分を慰める
  To console oneself. (literally.)
  To masturbate. (idiom.)
• masutaabeeshon マスターベーション
  masu マス
  "Masturbation." (katakanization.)
• hitori-ecchi 一人エッチ
  Sex alone.
• senzuri 千摺り
  (male) masturbation.
  • suru 摺る
    To rub. (suri, "rubbing," -zuri ～ズリ is rendaku.)
  • So it means "to rub one out," basically.
  • manzuri マンズリ
    (female) masturbation.
  • paizuri パイズリ
    "Boob-rubbing." Boob-job.
  • chikubizuri 乳首ズリ
    "Nipple-rubbing."
• onanii オナニー
  Masturbation. (from Onan, son of Judah, from the Bible.)
  • onanii suru オナニーする
    onaru オナる
    To masturbate.
  • onanizumu オナニズム
    Onanism. Masturbation.
    Indulging in self-pleasure instead of doing something properly. (e.g. in sports, arts, etc.)
  • onakin オナ禁
    Masturbation "ban." Abstaining from masturbating for some reason for a period of time.
  • onahooru オナホール
    onaho オナホ
    "Onahole." A kind of sex toy in the shape of a hole.
  • onabare オナバレ
    To be caught masturbating.
  • kuriona クリオナ
    Clitoral masturbation.
  • chikunii チクニー
    Nipple masturbation.
  • ananii アナニー
    Anal masturbation.
• shuin 手淫
  Masturbation. (using hands.)
  • This term can also mean masturbating someone else.
• jika hatsuden 自家発電
  Generating electricity at home. (e.g. with solar panels.)
  Masturbation.
• shigoku 扱く
  koku 扱く
  To stroke.
• tekoki 手コキ (or 手扱き)
  (male) hand-job. "Hand-stroking."
  • teman 手マン
    (female) fingering.
  • ashikoki 足コキ
    Foot-job. "Foot stroking."
  • shirikoki 尻コキ
    "Butt stroking." (stimulated by one's buttocks without penetration.)
  • wakikoki 腋コキ
    "Armpit stroking." (you get the idea.)
• ijiru 弄る
  To touch with one's hands, changing or probing it somehow. To fiddle with.
  • E.g. to fiddle (ijiru) a machine to figure out how it works, to fiddle with one's hair, to play with one's nipples while masturbating, to change the settings of a NPC character your friend made and end up making her fall in love with you somehow, etc.
  • sawaru 触る
    To touch. (deliberately.)
  • furu 触る
    To touch. (when two things happen to touch, whether deliberately or not.)
  • kosuru 擦る
    To rub. To touch against. (e.g. to rub against the fabric of one's clothes.)
• shikoru シコる
  To fap.
  • shikoshiko シコシコ
    *fap fap.* (mimetic word.)

And a related word:

• thisshu ティッシュ
  Tissue.

Manga: "JoJo's Bizarre Adventure," JoJo no Kimyou na Bouken ジョジョの奇妙な冒険 (Chapter 595)

• Context: a girl tells what she was seen doing.
• tsumari... dakara
  sono... ma
  つまり･･･だから　その･･･マ
  (stuttering) ma
• ma de hajimaru kotoba de
  マで始まる言葉で
  A word that starts with "ma."
• ...... ma...
  ･･････マ･･･
  ...... ma...
• masu......
  マス･･････
  Mas...
• sono, tsumari
  その　つまり
  (more stuttering)
• masuta~~
  マスタ～～
  Mastur~~
• .........~~~~~beshon...............
  ･････････～～ベション････････････
  ......~~~~bation............
• ... wo yo......
  ･･･をよ･･････
  (object marker: what was said previous was what she was seen doing.)

オカズ

The word okazu オカズ normally means "side dish" in Japanese, as in, food, but it can also means "something your masturbate to." For example: just plain old pornography, naked selfies from your girlfriend, a lemon fanfic of Dobby x Lucius Malfoy, wishful fantasies of getting laid with a hot celebrity from one of the Avengers movies, the paint drying on the wall, or whatever it is you saw and declared "I can fap to this."

• __ wo okazu ni shita 〇〇をオカズにした
  To have made ____ into [one's] "okazu."

Similar terms include:

• zurineta ズリネタ
  "Rubbing content."
  • The zuri is from senzuri, manzuri, and neta means "content," like the content of an article, or the plot of a story.
• shikorithi シコリティ
  "Shiquality." (from shiko and "quality.")
  • How good a zurineta is.
  • shikorithi ga takai
    シコリティが高い
    Shiquality is high. (i.e. something good to masturbate to.)
• onapetto オナペット
  "Masturbation pet." "Onapet."
  • From onanii and "pet," petto.
  • A person repeatedly used as zurineta. (or a video, etc.)
  • onadoru オナドル
    A person who became an "idol," aidoru アイドル, as in, a type of celebrity, in order to become an onapet for their fans.

Ejaculation

• shasei 射精
  Ejaculation. (technical.)
  • iru 射る
    To shoot. (e.g. an arrow.)
  • gansha 顔射
    Facial. "Face shot." (ejaculating on someone's face.)
• shasei suru 射精する
  To ejaculate.
  • shasei suru 写生する
    (totally not sexual homonym.)
    To sketch something while looking at it, as opposed to from your imagination.
• hassha 発射
  Firing. Catapulting.
  Ejaculation. (slang.)
  • In anime with giant robots, space rockets, etc. when they are put on those "launching platforms," hasshadai 発射台, this is the word the operator says before "launching" them.
• seitsuu 精通
  First ejaculation.
  • shosei 初精
    The first semen ejaculated. (note: in English spermarche, semenarche, is the "start of sperm development.")
• musei 夢精
  Nocturnal emission. Wet dream.
  • yume 夢
    Dream.
  • isei 遺精
    Ejaculation without sexual stimulation. (musei is one type of isei.)
• sourou 早漏
  Premature ejaculation.
  • hayai 早い
    Early.
  • moru 漏る
    To leak. (intransitive.)
• shiofuki 潮吹き
  Female ejaculation. Squirting.
  "Sea water blowing."
  • From whales blowing water upwards with their blowholes.
  • shio 潮
    Sea water.
  • fuku 吹く
    To blow.

A bunch of verbs that should have nothing to do with it, but do anyway:

• deru 出る
  To leave. To flow out. (e.g. ejaculate)
• dasu 出す
  To make leave. To put out. (i.e. to ejaculate.)
  To take out. (e.g. to take your penis out of your pants.)
  • nakadashi 中出し
    "To put out" inside. (cumming inside.)
  • sotodashi 外出し
    "To put out" outside.
• nuku 抜く
  To extract. (e.g. ejaculate.)
  • Sometimes it means "to masturbate."
  • nukigee 抜きゲー
    "Extracting game." A kind of adult video game.
• tamaru 溜まる
  To accumulate.
  • In the sense of not ejaculating as often as one would like.
  • Many dirty jokes involve this word because it can normally refer to stress accumulating, or work piling up, etc.
• kakeru かける
  To pour onto.
  • bukkake ぶっかけ
    Pouring onto.
  • bu' ぶっ
    Prefix that implies some force or impact.
  • bukkorosu ブッ殺す
    I WILL MURDER YOU. (korosu 殺す, "kill.")
  • buttobasu ぶっ飛ばす
    To send someone flying, like with a punch. From tobasu 飛ばす, "to make fly."
• shiboru 搾る
  To squeeze out [fruit juice].
  • sakusei 搾精
    Semen milking.

Sex

• seikou 性交
  Sexual intercourse.
• seikoui 性行為
  Sexual act.

セックス

The most common colloquialism for sex would be:

• sekkusu セックス
  "Sex."
• sekkusu suru セックスする
  "To sex." To have sex.

Some related terms:

• sekuhara セクハラ
  Sexual harassment.
  • sekushuaru harasumento
    セクシュアルハラスメント
• sekukyaba セクキャバ
  Sex-cabaret.
  • A cabaret club, kyabakura キャバクラ, in which the employees are topless or wearing sexy outfits.
• sefure セフレ
  "Sex friend." Fuck buddy. (a friend whom you have sex with.)
  • sekkusu furendo
    セックスフレンド
• kimeseku キメセク
  Sex on drugs. (rock and roll not a requisite.)
  • kimeru キメる
    To take [a drug]. (transitive.)
  • kimaru キマる
    To get high. (intransitive.)

Some people avoid saying the word sekkusu because it sounds vulgar, preferring something like:

• ecchi エッチ
  Sex.
  Sexy.
  Perverted.
  • Also spelled as an "H."
  • In fact it comes from the letter H, because it comes from the romaji of hentai 変態, which means "pervert."
• ecchi suru エッチする
  To have sex.
  • hitori-ecchi 一人エッチ
    Sex alone. Masturbation.
• neru 寝る
  To sleep.
  To sleep [with someone].
  • Also where comes the infamous terms:
  • netoru 寝取る
    To take "sleeping."
    To sleep [with someone else's partner].
  • netorareru 寝取られる
    (passive form.)
    To be netoru'd
    For someone who's not your partner to sleep with you.
• suru する
  To do.
  • Just... "to do."

Or something so far-fetched nobody will actually understand it:

• nakayoshi 仲良し
  To make peace. "To get on good terms."

Or something that people don't really say but you may see in anime:

• gattai 合体
  To combine.
  • Like giant robots!

Then we have this extremely confusing word:

• yaru やる
  • To do something.
  • Synonymous with ageru:
    • To give something to someone.
    • To do something for someone.
  • To kill someone.
  • To have sex with someone

And yes, it actually means all that stuff:

• yaritai koto
  やりたいこと
  Something [you] want to do.
• banana wo yaru
  バナナをやる
  [I'll] give [you] a banana.
• oshiete-yaru
  教えてやる
  [I'll] teach [you]. [I'll] tell [you].
• kare wo yatta zo
  彼をやったぞ
  [I] killed him.
• yaranaika?
  やらないか？
  Won't [you] do [it]? (do it = have sex.)

It's seen in the words:

• yarinige
  やり逃げ
  To do and run away.
  To have sex with someone and then "run away," i.e. never contact them again.
• yarichin
  ヤリチン
  A promiscuous man.
  • A doing (yari) penis (tin), in the sense it does it a lot.
• yariman
  ヤリマン
  A promiscuous woman.

Similar words:

• bicchi
  ビッチ
  Slut. (wasei-eigo, from the English "bitch.")

Character: Fujiwara Chika 藤原千花
Anime: Kaguya-sama wa Kokurasetai? ~Tensai-Tachi no Ren'ai Zunousen~ かぐや様は告らせたい？～天才たちの恋愛頭脳戦～ (Season 2) (Episode 3)

• shiri-garu-onna
  尻軽女
  A promiscuous woman.
  • shiri ga karui
    尻が軽い
    [Her] butt is light. (literally.)
    [She] is promiscuous. [She] is a slut.

Other terms:

• omanko suru おまんこする
  omeko suru おめこする
  To have sex.
  • From the slangs for vagina: omanko, omeko.
  • So "to vagina," literally.
• hameru ハメる (or はめる)
  To put in. (e.g. your hand into a glove, or wrist into handcuffs.)
  To have sex. (colloquialism.)
  • hamedori ハメ撮り
    "Sex [film] taking."
    POV pornography. A sex video in which someone who's having sex films it, as opposed to a third party.
  • toru 撮る
    To take [a photo]. To take [a film].
• horu ほる
  To dig.
  To have gay sex. (colloquialism. See okama オカマ.)

Terms related to real-life gay relationships:

• neko ネコ
  Bottom.
• tachi タチ
  Top.
• riba リバ
  "Reversible." Switch.
• 凸凹回
  Top, bottom, switch. (symbols used in dating sites.)

Terms used mostly by fujoshi characters shipping fantasy gay relationships:

• seme 攻め
  "Offense." Attack.
  Top.
  Assertive.
• uke 受け
  "Receive."
  Bottom.
  Passive.
• mamori 守り
  "Defense."
  • Not a sexual slang, but you may hear a fujoshi character ask "what's the opposite of seme (offense/top)?" A normal character will answer mamori (defense), a savvy character will answer uke (bottom).

Sex-Related Terms

(wait a second...???)

• seiteki shigeki 性的刺激
  Sexual stimulation.
• seiteki koufun 性的興奮
  Sexual excitement. Arousal.
  • koufun suru 興奮する
    To get excited. (not necessarily sexual.)
• seikantai 性感帯
  Erogenous zone. "Sexual feeling region."
• yokubou 欲望
  Desire. (generic sense.)
  • jouyoku 情欲
    Lust.
  • seiyoku 性欲
    Sexual desire.
• uzuku 疼く
  To throb painfully.
• hatsujou 発情
  Desire to mate.
  • hatsujouki 発情期
    Mating season. (of animals.)

There are various ways to say "sexy," like:

• eroi エロい
  Erotic.
  • ero-kawaii エロ可愛い
    Sexy and cute.
• ecchi na エッチな
  Lewd.
• iroppoi 色っぽい
  Sexy.
  • A combination of two words that certainly shouldn't mean sexy but do.
  • iro 色
    Color.
  • -ppoi ～っぽい
    Like. Resembling.
  • inu ppoi 犬っぽい
    It's kind of like a dog.
    It resembles a dog.
• sekushii セクシー
  "Sexy."

Verbs related to sexual intercourse:

• sounyuu suru 挿入する
  To introduce.
  To penetrate.
• ireru 入れる
  To put in. (general.)
  • ireru 挿れる
    To put in. (sexual.)
• tsuku 突く
  To thrust.
• ugokasu 動かす
  To make [something] move. (transitive.)
  • ugoku 動く
    To move. (intransitive.)
• pisuton ピストン
  Piston.
• shimaru 締まる
  To tighten.
  To contract.
• shime-tsukeru 締め付ける
  To tighten and adhere to.

Other related words:

• zengi 前戯
  Foreplay. (stuff before sex.)
• honban 本番
  Actual performance. (in TV shows, when it's not a rehearsal, test, etc. it's for real.)
  Sex. Vaginal penetration.
  • Sometimes associated with prostitution, because a couple won't call "sex" honban, it's only honban in contrast to whatever part of it isn't honban.
• kougi 後戯
  (stuff after sex.)
• nama 生
  Raw. (as opposed to protected sex.)
  • namahame 生ハメ
    Raw sex. Bareback.
• adaruto bideo アダルトビデオ
  "Adult video."
  • ee-bui エーブイ
    AV.

Sex Positions

• taii 体位
  Position of the body.
  Sexual position.
• seijoui 正常位
  "Normal position."
  Missionary.
• kijoui 騎乗位
  "[Horse] Mounting Position."
  Cowgirl.
• kouhaii 後背位
  bakku バック
  "Behind back." "Back."
  Doggy style.
• zai 座位
  "Sitting position."
  Lotus position.
• sokui 側位
  "Lateral position."
  Spooning. Spoons position.
• shikkusu-nain シックスナイン
  "Six nine." Sixty nine. 69.

Sex Toys

There are various terms for sex toys, and tools, in Japanese:

• seigu 性具
  "Sexual tools."
• ingu 淫具
  "Lewd tool."
• otona no omocha 大人のおもちゃ
  Adult toy.
  • Note that omocha is also spelled:
  • omocha 玩具
  • From:
  • moteasobu 玩ぶ
    To play with [something you hold in hands].
    To toy with [somebody's emotions].

Some terms for toys and tools:

• dhirudo ディルド
  Dildo.
  • harikata 張形 (or harigata)
    "Swollen form." Dildo. (note: the Hector's dolphin is called seppari iruka 背張海豚, due to its "swollen back.")
  • kokeshi コケシ
    Dildo. (which's shaped like a kokeshi doll.)
• baibu バイブ
  baibureetaa バイブレーター
  "Vibrator."
  • shindou 振動
    Vibration.
  • pinku rootaa ピンクローター
    rootaa ローター
    "Pink rotor." Love egg. Egg vibrator.
  • rimokon リモコン
    Remote control.
• hitachi majikku wando 日立マジックワンド
  Hitachi Magic Wand.
• anaru puragu アナルプラグ
  Anal plug. Butt plug.
• anaru biizu アナルビーズ
  Anal beads.
• kanchou 浣腸
  Enema.
• onahooru オナホール
  onaho オナホ
  Onahole. Sex sleeve.
• dacchi waifu ダッチワイフ
  "Dutch wife." Sex doll. Blowup doll. (not to be confused with trash.)
  • rabu dooru ラブドール
    "Love doll." (refers to a high-quality type.)
• enemagura エネマグラ
  Prostate massager.
  "Enemagra." (proprietary eponym.)
  • zenritsusen massaaji-ki
    前立腺マッサージ器
    Prostate massage utensil. (generic name.)
  • anerosu アネロス
    Aneros. (another brand.)
• peniban ペニバン
  penisubando ペニスバンド
  "Penis-band." Strap-on.

Orgasm

• zecchou 絶頂
  "Climax."
  • This can be the climax of a story, the peak of a mountain, etc.
  • seiteki zecchou 性的絶頂
    Sexual climax. (unambiguous.)
• oogazumu オーガズム
  "Orgasm." (English.)
• orugazumu オルガスムス
  "Orgasm." (German.)
• akume アクメ
  Orgasm. "Acmé" (French.)
• dorai oogazumu ドライオーガズム
  "Dry orgasm."
• tokoroten ところてん (or 心太, 心天, 瓊脂)
  A dish made from tengusa 天草, a type of red algae, using a special tool called ten-tsuki 天突き, "heaven thrusting," (but the "heaven," ten, probably refers to tengusa, tokoroten), with which the tengusa, after turned into jelly, is pushed into a cheese-grater kinda thing with holes and comes out as noodles.
  • A video, if you really want to know: ところてん（テングサ）の作り方 - youtube.com.
  • From the way it's made:
  • tokoroten-shiki ところてん式
    Tokoroten ceremony.
    When someone is naturally pushed out, usually in a bad sense. For example, in Sumo wrestling there was a rule that there could only be five oozeki 大関. But then a sixth one showed up. So the oldest one of the five was "pushed out" to the next rank, yokodzuna 横綱, in order to maintain five oozeki.
  • And finally, what's relevant to this article:
  • tokoroten ところてん
    For a man to have an orgasm from anal alone. (in the sense of "pushing out" the semen from behind.)

In English, the verb "to cum" is a slang for "to orgasm." It's sometimes spelled "to come." Such that "I'm coming" becomes a double entendre. In Japanese, the word for "to come" is kuru 来る, but it doesn't carry this orgasm meaning.

On the other hand, the word iku 行く, "to go," does mean "to orgasm" in Japanese. So "to come" is English and "to go" is Japanese. Why, though? Is this some sort of coincidence or something? Was this on purpose? Anyway, it's normally spelled with katakana, not with kanji:

• iku イく (or イク)
  To cum. To orgasm.
  • When conjugated, it's homonymous with other words, like:
  • iu 言う
    To say.
  • itta 言った
    [I] said.
  • itta イった
    [I] came.

Terms for orgasm expressions:

• ikigao イキ顔
  "Cumming face." (from iku.)
• torogao トロ顔
  "Dozy face" (from torotoro トロトロ, "dozing off.")
• ahegao アヘ顔
  "Panting face." (from aheahe アヘアヘ, *pant pant*)

Manga: Boku wa Tomodachi ga Sukunai 僕は友達が少ない

• toku ni tsuinzetto to nigouki ga
  douji ni zecchou wo
  mukaeru toki no hyoujou ga
  mou saikou desu ne
  特にＺＺ（ツインゼット）と弐号機が同時に絶頂を迎えるときの表情がもう最高ですね
  In particular, the expression [on their faces] when Twin-Z and Machine #2 simultaneously approach climax is the greatest.
• konna ii ahegao wo kakeru
  sakka wa sousou imasen yo
  こんないいアヘ顔を描ける作家はそうそういませんよ
  There aren't so many artists who can draw ahegao this good.

Virginity

In Japanese, there are two different terms for "virgin."

• doutei 童貞
  Virgin. (usually male.)
• shojo 処女
  Virgin. (female.)

About one's first time:

• shotaiken 初体験
  First experience.
  • hajimete 初めて
    First time.
• doutei soushitsu 童貞喪失
  shojo soushitsu 処女喪失
  Losing [one's] virginity.
• sotsugyou suru 卒業する
  To graduate. (literally.)
  • daigaku wo sotsugyou suru
    大学を卒業する
    To graduate university.
  • doutei wo sotsugyou suru
    童貞を卒業する
    To graduate [being] a virgin.
• fude-oroshi 筆おろし
  Lowering a brush.
  • In the sense of lowering it onto a canvas below, to use it, for the first time.
  • For a guy to lose his virginity.
  • orosu 下ろす
    To lower. To put down.

Regarding romantic assertiveness:

• soushokukei-danshi 草食系男子
  Herbivorous guys.
  • Men who aren't romantically assertive, who don't go after girls.
  • nikushoukei-joshi 肉食系女子
    Carnivorous girls. (romantically assertive women.)

Conception

• ninshin 妊娠
  Conception. Pregnancy.
• haramu 孕む (or 妊む)
  To become pregnant with [a child].
  • ko wo haranda 子を孕んだ
    To have become pregnant with a child.
  • haramaseru 孕ませる
    To make [someone] become pregnant with [a child]. (causative conjugation.)
    To impregnate.
• umu 生む
  To give birth to [a child].
  • ko wo unda 子を生んだ
    To have given birth to [a child].
• tainai 胎内
  Interior of the womb of a pregnant woman.
• kodzukuri 子作り
  "Baby-making." Having children. Attempting to conceive.
• hinin 避妊
  "Avoid pregnancy."
  Contraception. Birth control.
  • sakeru 避ける
    To avoid.

Notable contraception methods:

• kondoomu コンドーム
  "Condom."
  • Also called:
  • gomu ゴム
    "Rubber."
  • sukin スキン
    "Skin."
  • furenchi retaa フレンチレター
    "French letter."
• gomu-ari ゴムあり
  Condom existing.
  With a condom.
  • gomu-nashi ゴムなし
    Condom non-existent.
    Without a condom.
• keikou hinin yaku 経口避妊薬
  "Oral contraceptive medicine."
  Birth control pill.
  • piru ピル
    The "pill."

An antiquated device that's part of some jokes from time to time:

• teisoutai 貞操帯
  Chastity belt.
  • teisou wo mamoru
    貞操を守る
    To protect [one's] chastity.

フェラチオ

Regarding specifically oral sex:

• ferachio フェラチオ
  fera フェラ
  Fellatio. Blowjob.
• iramachio イラマチオ
  Irrumatio. Face-fucking.
• shaburu しゃぶる
  To suck and lick.
  • chinshabu ちんシャブ
    Penis-sucking.
• kuwaeru 咥える
  To hold [something] into [one's] mouth.
  • pan wo kuwaete hashiru
    パンを咥えて走る
    To run with a bread in mouth. (if you know what I'm talking about.)
• gokkun ごっくん
  Gulp. (onomatopoeia.)
  Semen-swallowing.
• kun'niringusu クンニリングス
  kun'ni クンニ
  Cunnilingus.
  • Not to be confused with:
  • kan'ningu カンニング
    "Cunning." Cheating on an exam.

Manga: Inuyashiki いぬやしき (Chapter 18)

• shabure......
  しゃぶれ･･････
  Suck [it]..... (imperative form of shaburu.)

姦

A lot of Japanese words for sex have kan 姦 in it, including some made-up slangs about some really weird stuff.

• wakan 和姦
  Consensual sex. "Harmonious sex."
• goukan 強姦
  Forced sex. "Strength sex." (strength = force.)
• rinkan 輪姦
  Gang rape. "Wheel sex." (in the sense of a group surrounding someone.)
• soukan 相姦
  Adultery.
• kinshin soukan 近親相姦
  Incest.
• aokan 青姦
  Sex outdoors. "Blue sex."
• juukan 獣姦
  Bestiality. "Beast sex."
• shikan 屍姦
  Necrophilia. "Corpse sex."
• kikaikan 機械姦
  "Machine sex."
• shikan 視姦
  Ogling. Leering. "Sight sex."
  • Wait a minute, this isn't actually sex!

Some "grotesque," guro グロ, terms that include kan 姦. Obviously these only refer to illustrations, not real people:

• noukan 脳姦
  "Brain sex." Brain-fucking.
• gankoukan 眼孔姦
  "Eye socket sex."

レイプ

The word goukan 強姦 is the formal term for "rape" in Japanese. In the general sense, there's also:

• okasu 犯す
  To do something you shouldn't do.
  To violate [a law]. To break [a rule].
  To commit [a crime].
  To rape [a person].
• yaru 犯る
  To do [a crime].
  To rape [a person.
  • A gikun for yaru やる.

And this word that won't air on TV:

• reipu レイプ
  "Rape."

It has derived terms like:

• reipu-me レイプ目
  "Rape eyes." (as in the victim's.)
  • Anime term referring to the "vacant eyes" drawn in hopeless characters.
• gyaku-reipu 逆レイプ
  "Reverse rape."
  • Same logic as nanpa ナンパ, "to hit on," in which you assume it's about men hitting on women, so gyaku-nanpa 逆ナンパ is "women hitting on men."
  • Abbreviated gyaku-re 逆レ and gyaku-nan 逆ナン respectively.

Also related:

• chikan 痴漢
  Molestation. (a crime.)
  (male) molester.
• chijo 痴女
  (female) molester.

Counting

In Japanese, counting is done with rather specific, but also confusingly ambiguous counters. For reference, some words that can end up being taken suggestively:

The counter for penises, phallic objects, dildos, pencils, bananas, swords, strands of hair, arms, legs, and other long, cylindrical objects in general is hon 本.

• ippon 一本
  One [banana].
  • banana ippon バナナ一本
    "One banana."
• nihon 二本
  Two [bananas].
• sanbon 三本
  Three [bananas].
• nanbon 何本
  An unknown number of [bananas].
  How many [bananas]?

But wait, are testicles part of the penis? Because then it's not cylindrical anymore. Well, let's not think deeply about this.

The counter for vaginas, if we're talking about the vagina as an orifices, would be ana 穴, "hole." Just like the mouth, and the anus, are also holes, except when counting it's normally read with its on'yomi, ketsu 穴, because ichi, ni, san are on'yomi while hito-, futa-, mi- are kun'yomi.

• ikketsu １穴
  hito-ana 一穴
• One hole.
• niketsu ２欠
  futa-ana ニ穴
  Two holes.
• sanketsu ３穴
  mi-ana 三穴
  Three holes.
• nanketsu 何穴
  nan'ana 何穴
  An unknown number of holes.
  How many holes?

The counter for ejaculations, shots, gun shots, hits, strikes, punches, etc. is hatsu 発.

• ippatsu 一発
  One shot. One hit.
• nihatsu 二発
  Two shots. Two hits.
• sanpatsu 三発
  Three shots. Three hits.
• nanpatsu 何発
  An unknown number of shots.
  How many shots?

The counter for sexual intercourse, or the number of times anything at all is done repeatedly, is kai 回.

• ikkai 一回
  One time. Once.
• nikai 二回
  Two times. Twice.
• sankai 三回
  Three times. Thrice.
• nankai 何回
  An unknown number of times.
  How many times?

The counter for sexual partners, or people in general, is -ri ～人 or nin 人.

• hitori 一人
  One person.
• futari 二人
  Two people.
• san'nin 三人
  Three people.
• nan'nin 何人
  An unknown number of people.
  How many people.
  • nan'nin mo 何人も
    A lot of people. (more people than you can know.)
  • If this is combined with yaru, you get this ambiguity:
  • nan'nin mo yatta 何人もやった
    [Someone] killed a lot of people.
    [Someone] fucked a lot of people.

In the case of orgies, there's a slang to count the number of people in it: pii ピー, which comes from the katakanization of the English letter P. This P can refer to the "page number" of a book, manga, etc. It can also refer to the number of "players" in a video-game. Which is where the orgy slang probably came from.

• ichi-pii １Ｐ
  One player. One page.
• ni-pii ２Ｐ
  Two players. Page two.
  • ni-pii karaa ２Ｐカラー
    Player 2 color. (a different color scheme for a same character, from fighting games where two players can select the same character. E.g. Bowsette blonde and red-hair versions.)
• san-pii ３Ｐ
  Three players. Page three.
  An orgy of 3 people. Threesome.
• yon-pii ４Ｐ
  Four players. Page four.
  An orgy of 4 people. Foursome.
• go-pii ５Ｐ
  Five players. Page five.
  An orgy of 5 people. Fivesome.

Graffiti

Regarding body writing:

• rakugaki 落書き
  Scribble. Sketch.
• karada ni rakugaki 体に落書き
  Scribble on body. Body graffiti.

Since you could write virtually anything on someone's body, I'm not going to list everything you could write. Instead, let's focus on the noteworthy things:

Manga: Seitokai Yakuindomo 生徒会役員共 (Chapter 2)

• omankomaaku おマンコマーク
  mankomaaku マンコマーク
  omekomaaku オメコマーク
  The "pussy mark" refers to a symbol featuring two concentric circles ◎, one vertical line ｜, and ticks around the outer circle representing pubes.

Note to be confused with:

Anime: Shimoneta to Iu Gainen ga Sonzai Shinai Taikutsu na Sekai 下ネタという概念が存在しない退屈な世界 (Episode 2)

• hatsudensho no maaku 発電所のマーク
  Power plant mark.
  • Reminder, jika hatsuden 自家発電, "generation electricity at home," is a slang for "masturbation."

• ＊
  The asterisk is often likened to the anus, specially of cats, because of its sphincter-like shape.

• sei no ji 正の字
  The 正 character.
  • This is the Japanese tally mark.
  • It has five strokes, so each 正 means five.

• niku 肉
  "Meat."
  • The word nikubenki 肉便器, literally "meat urinal," is a degradatory term often used in body writing.
  • However, niku 肉, specially when written on one's forehead, is a reference to the manga Kin'niku-man キン肉マン, and its protagonist, which has niku 肉 written on its forehead.

Abbreviations

For reference, the way some words are abbreviated in slangs:

• pai パイ
  From oppai おっぱい, "breasts."
• kuri クリ
  From kuritorisu クリトリス, "clitoris."
• man マン
  From manko マンコ, "vagina."
• chin チン
  From chinko チンコ, "penis."
• ona オナ
  nii ニー
  From onanii オナニー, "masturbation."
• seku セク
  se セ
  From sekkusu セックス, "sex."
• peni ペニ
  From penisu ペニス, "penis."
• jii-supo Ｇスポ
  From jii supotto Gスポット, "G-spot."

Some examples:

• furuchin フルチン
  "Full penis." In the sense of being completely naked, as to expose even the penis, no trousers.
• yokochin 横チン (or ヨコチン)
  "Horizontal penis." In the sense of escaping the underwear horizontally.
  • hamichin ハミチン
    (same meaning.)
  • hamidasu 食み出す
    To protrude. To stick out.
  • hamikin ハミ金 (or ハミキン)
    (same thing but with testicles, kintama, instead.)
• In Gintama, episode 256, there was a joke anime inside the anime that was called Mantama まんたま, in which most of the world was female.

References

• Etymology of Abdominal Visceral Terms - www.dartmouth.edu/~humananatomy/, accessed 2019-04-24.
• 性風俗用語大辞典 性風俗に関する用語説明集 - lewd.sakura.ne.jp, accessed 2019-04-26.
  A dictionary of sex-related terms in Japanese. Could be a little outdated since it was last updated in 2013.