Hentai (変態 or へんたい) 
listen (help·info) is a Japanese word that, in the West, is used when referring to sexually explicit or pornographic comics and animation, particularly Japanese anime, manga and computer games (see Japanese pornography). In Japan it can be used to mean "metamorphosis" or "abnormality". The word "hentai" has a negative connotation to the Japanese and is commonly used to mean "sexually perverted". In Japanese the word hentai is a kanji compound of 変 (hen meaning "change" "weird" or "strange") and 態 (tai meaning "attitude" or "appearance"). The term is used as a shortened form of the phrase 変態性欲 (hentai seiyoku), or "sexual perversion". In slang, 変態 (hentai) is used as an insult meaning roughly "pervert" or "weirdo". The term is not often applied to pornography in Japan. Instead, terms such as 18-kin (18禁, literally "18-prohibited") meaning "prohibited to those not yet 18 years old", and seijin manga (成人漫画 "adult manga") are used when referring to pornography. The English letters AV are also used, standing for adult video.
Yaoi is predominantly aimed at a female audience and commonly features males of ambiguous gender—in both physical appearance and mannerism—called bishōnen, literally "beautiful boy". Some feature biseinen ("beautiful man"), males of more adult or masculine appearance than bishōnen. Less common are bara—larger, often heavily muscled and sometimes hairy males, the yaoi counterpart of the "bear" in gay pornography—as well as oyaji (meaning "daddy" or "uncle"), featuring middle-aged and elderly men; these types are mainly found in material aimed at gay men, which may be called bara or 'men's love' (ML), and is considered to be distinct from yaoi. Yaoi also extends beyond the (sexually explicit) hentai genre, since it is an applies to any anime/manga material that includes male homosexuality (except for that actually aimed at a gay male audience). In Western usage, yaoi is distinguished from shōnen-ai (literally, "boy-love"), in which two males merely express romantic feelings for each other without actually having sexual relations. Women interested in Yaoi are called "Fujoshi" (腐女子), a pun which translate loosely as "rotten girl" or "rotten woman". Compare fag hag and slash fandom.
The scope of hentai encompasses the entire range of sexual fetishes, including:
- Bakunyū, the depiction of women with large breasts. Literally translated to "bursting breasts".
- Futanari, depictions of hermaphrodites or transsexuals that have both phallic genitalia (penis with scrotum, only a penile shaft, or an enlarged clitoris) and vaginal genitalia or a feminine hourglass shape including breasts and a penis plus scrotum.
- BDSM, A spectrum of consensual sexual activities considered to be "kinky" or non mainstream, including such topics as power exchange (domination and submission), bondage, sadomasochism, spanking, etc..
- Bestiality
- Breast-oriented torture and Breast bondage, BDSM practices focusing on breasts, many times coupled with a variety of torture.
- Erotic lactation
- Lolicon, depicts prepubescent or preadolescent girls.
- Maiesiophilia
- Omorashi (オモラシ / おもらし / お漏らし) in which individuals struggle with a full bladder before finally wetting themselves (also known as watersports).
- Urolagnia: Urinating
- Coprophilia: Feces
- Shotacon, the depiction of young boys having intercourse with other young boys or older men, or depicting young boys with older women, known as "straight shota" in western jargon.
- Tentacle rape, the depiction of tentacled creatures and sometimes monsters (fictional imaginative or otherwise, also includes alien-like creatures) engaging in sex or rape with girls and less often men.
- Incest sexual activity with legal family members noticeably seen in The Sagara Family, a hentai computer game.