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Hentai is defined differently in English. Usage of the term hentai does not define a genre in Japan. Less official terms also in use include ero anime ( エロアニメ), ero manga ( エロ漫画), and the English initialism AV (for "adult video").
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: 100 Japanese pornographic works are often simply tagged as 18-kin ( 18禁, "18-prohibited"), meaning "prohibited to those not yet 18 years old", and seijin manga ( 成人漫画, "adult manga"). : 99 While the term has expanded in use to cover a range of publications including homosexual publications, : 107 it remains primarily a heterosexual term, as terms indicating homosexuality entered Japan as foreign words.
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The character hen is catch-all for queerness as a peculiarity-it does not carry an explicit sexual reference. In sexual contexts, it carries additional meanings of " perversion" or "abnormality", especially when used as an adjective : 99 in these uses, it is the shortened form of the phrase hentai seiyoku ( 変態性欲) which means "sexual perversion". Hentai is a kanji compound of 変 ( hen 'change' or 'weird') and 態 ( tai 'appearance' or 'condition'), and means "metamorphosis" or "transformation".