Well, sometimes it's some kind of fetish. The whole idea of rape and crap. Personally, hentai and real porn both have their ups and downs. I think real porn is great but at the same time, it sucks. Some girls have red vaginas (thanks for pointing it out qygibo) skin blotches, freckles, WAY too much hair, birthmarks, and huge clits. Like wtf is that?!?
Hentai, on the other hand, has some wierd ass fetishes that get a little too kinky for me. But once you find some good hentai and some good real porn, it's magical. ^^