The problem with porn is that it purports to be reality, but it is fantasy. Thus it makes people expect fantasy in real life, and thus disappoints them, making them in a sense sexually unfit for real life. Unless the fantasy is a violent one, in which case (alas!) they are able to make the fantasy real by themselves.

But I was supposed to be humorous, wasn't I?

Fart. Fart fart fart.

Hope that helps.

Alex