Hentai (変態 or へんたい^?)is a word of Japanese origin which is short for (変態性欲^?, hentai seiyoku); a perverse sexual desire.

In Japanese, the term describes any type of perverse or bizarre sexual desire or act; it does not represent a genre of work. Internationally, hentai is a catch-all term to describe a genre of anime and manga pornography. English adopts and uses hentai as a genre of pornography by the commercial sale and marketing of explicit works under this label.