Rape porn is the #1 form of porn in Japan, next would be teen porn. Japan has always been in to the whole rape and school girl thing and over there it is more acceptable maybe tolerable is a better word then over here where both are looked down at as perversion. Currently groping women in subways and buses and in stores is pretty big in porn over at Japan.

It's definitely the adrenaline thing, the power and excitement. I think society mostly defines what is acceptable and what isn't, but that doesn't effect how individual people feel.