Japanese Sex Slang
Ass Ketsu
Dembu (a politer form, analogous to the English derriere or posterior)
Shiri (politer yet, especially among women. Analogous to bottom)
Anal Sex Anaru sekkusu
Asshole Ketsu no ana
Kikuza (means chrysanthemum, similar to the English term rosebud)
Asshole (As insult) Kusottare (literally, "Shit-drip")
Kora! (Rough, as in "Hey asshole!" Roll the R for more effect, and say quickly.)
Attraction Tamaranai (an uncontrollable compulsion)
Balls, Testicles Kintama (golden balls)
Bondage Shibari
Boyfriend Boifurendo (from English)
Breasts Mune
Oppai
Buttocks, Buns Shippeta
Condom Raba (from English rubber)
Dirty Old Man Ero-jiji
Dyke, Lez Rez
Dyke, bull Otoko onna, or "man-woman"
Enema Kancho
Erection Pin. This is a playful term. "Pinpin-chan" is an affectionate name meaning "Mr. Boing Boing" in reference to a young man's penis that is always on the verge of erection.
Katajunara (to become hard)
Faggot Okama
An effeminate homosexual is "neko." Neko means cat in Japanse. This word may also also mean a femme dyke. Neko yaru, or"doing cat" is a synonym for gay sex, or sometimes kinky sex between hets.
Fellatio Kyande (from candy)
Fera, ofera
Femdom Joken
Foot Fetishist Ashiname-ma (The ma means devil)
Fuck! Kuso! Used as an interjection, like "Shit!" or "Damn!"
Fuck me! Hamete chodai!
Fuck me hard! Fukaku hamekonde chodai!
Gay Gei (from English, obviously)
Bara Zoku (Rose Gang or Family)
Girlfriend Garufurendo
Hardcore Hado koa (used in the gay community)
Humiliation, mild Shuchi pure
"I'm coming!" Iku...Iku!
Jerkoff Sutabeshan (from masturbation)
Kink Hentaisei
Neko yaru ("to do cat")
Lesbian Rezubian (from English)
Riri Zoku (Lili Gang or Family)
Lesbian Sex Kaiawase (literally, cunt-grinding)
Rezuru
Lover Aijin (adulterous affair)
Koibito
Masturbation, general Hitorigokko (self-play)
Masturbation, male Senzuri (a hundred rubs)
Shiko shiko
Masturbation, female Manzuri (ten thousand rubs)
Suichi o ireru (flicking the switch, or fingering a clit)
Penis Chinchi, chinko, chimpo, chimpoko (cute terms analogous to pecker, dick, willy, or wee-wee)
Shakuhachi (from old style Japanese flute)
Penile exposure Furuchin (wagging penis)
Pervert Hentai
Chikan (men who fondle women on Japan's notoriously crowded commuter trains)
Prostitution Enjo kosai (money-for-sex)
Prostitute Joro
Abazure (literally, "saucy old woman" but has a modern reading as noisy slut)
Baita (means sale-woman, or whore)
Pussy, Cunt Omanko
Haka ("Box." This is self explanatory.)
Rape Gokan
Raunchy Eroi (from erotic)
Scat games Unko pure (I think the pure comes from English play)
Schoolgirl Kogal. A "high school gal" who is willing to trade sex for money.
Sex Tape Ero kasetto
Sixty-nine Ainame
Slut Yariman. Means "Doing-it Manko" or "10,000 time doing-it." Well known as one of the dirtiest words in Japan. Unlikely to see in print.
Spank Oshiri o butsu/tataku
Ketsu-naguri
Stud Iro otoko
Training (sexual) Chokyo
Transexual Futanari
Tits Chichi
Tit-fuck Paizuri
Urine shower, facial Gan-men Shawaa
Vagina, vulva Omanko, wareme(very dirty forbidden japanese word)