The best theory I've read about porn has been the one at the intellectual whores web site, but I'll put it in my own words. In porn, men are usually seduced by the women: she prances around dressed in a skimpy outfit and dictates ("flock me!", etc). For a man that's a fantasy because in real life it's kinda supposed to be the other way around: men are supposed to have power and make the decisions. P.S It's just a theory.