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Hentai is a Japanese word that can be used to mean "metamorphosis" or "abnormality". In Japan "hentai" has a negative connotation, and is commonly used to mean "sexually perverted". In the West the term is used as slang for sexually explicit or pornographic comics and animation, particularly Japanese anime, manga and computer games (see Japanese pornography).
In Japan sexually explicit material is more often referred to as "jū hachi kin" ( prohibited for sale to persons under 18), "Hentai anime" (sexual/pornographic anime), "seinen" ( adult, not to be confused with young adult), or with the prefix "ero". Hentai anime and manga allow elements of sexual fantasy to be represented in ways that would be impossible to film. This may include portrayals of sexual acts which are physically impossible, unacceptable in society, or run counter to social norms. Examples include extreme bondage, creatures with tentacles, and other fetishes. Shunga artists like Yoshitoshi and Kuniyoshi showed gang rape, erotic crucifixion, and even forced late third-trimester abortions by a "cannibal witch."
In Japanese the word hentai is a kanji compound of (hen meaning "change" "weird" or "strange") and (tai meaning "attitude" or "appearance"). The term is used as a shortened form of the phrase (hentai seiyoku), or "sexual perversion." In slang, (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, literally "18-prohibited") meaning "prohibited to those not yet 18 years old", and seijin manga ( "adult manga") are used when referring to pornography. The English letters AV are also used, standing for adult video.
The English use of "hentai" is more similar to the way the Japanese use the slang term (H, etchi, often spelled ecchi), which refers to any sexually explicit content or behavior. Etchi is simply the spelling-out of the Japanese pronunciation of the letter H. The origins of this term are uncertain, but it may be a shortened form of hentai used as a polite codeword in the 1960s.
"H" in Japan is now broadly used to refer to all sexual content or activity, so "H manga" are manga with sexual content. Also, the term "ero" , short for "erotic" but closer in meaning to "porn", is now used more often instead of "H".
Exactly how the term hentai came to refer to all sexually explicit content in American anime fandom is unknown. With the rise of the World Wide Web, however, the term was extensively promoted by pornographic sites selling access to (frequently bootlegged) erotic manga. Banner ads promoting these sites might, for instance advertise "live girls and hentai", with the latter meaning erotic manga as opposed to photographs. Compare otaku for another word altered somewhat in this transition.