Japanese hentai can come in a wide variety of forms, some of which are extremely graphic and involve intense sexual images. Extreme hentai can take the form of tentacle sex, futanari (dickgirls) as well as TS (transsexual) sex, lolicon, and BDSM sex.
Bondage/discipline Sadomasochism (BDSM) is a form of sexual expression that is considered outside of the social norm of most cultures. It can involve the tying up, spanking, dominating, and mild torturing of individuals for sexual pleasure. This theme is very popular in all forms of hentai publications as well as online games.
The hentai bdsm sexual theme even appears in publications that are not directly concerned with the topic. It is not unusual to find elements of bondage in ‘normal’ hentai manga stories. Often this is in the form of mild bondage scenes where the young female is ‘taken advantage’ of while she is temporary incapacitated by being stuck in a compromising position (such as wedged in a door or a hole in the wall). Where bondage and spanking is usually found as a main topic is in hentai anime.