Hentai is the Japanese word for materials that have sex and sexual situations as the bases for their stories.
The word means ‘sexually perverse’ and applies to a variety of mangas (comics), anime (animated cartoons), and various videos and movies. Hentai is very popular in Japan and has a growing fan base outside of the country. Hentai comes in many different categories from the mild form of ecchi (soft porn) to more extreme expressions of sexuality such as futanari (dickgirls), tentacle rape and bondage (bdsm) based themes.
Bondage hentai has a very loyal fan base in Japan and the theme often runs through mangas and anime that are not even devoted to the fetish. It is not uncommon to find elements of bdsm in fantasy, science fiction and even school girl themed hentai. There has been a growing popularity in hentai bdsm movies that have been made available by the Japanese doujinshi artists. The doujinshi are independent producers of hentai materials who usually create the more extreme forms of hentai often based on well established and known characters.