For a very long time, I didn't watch porn at all. I was much more comfortable with reading (and writing) erotica to get my rocks off. Comics can be good, too. It's only in the past year or so that I've at all bothered to go looking. Weirdly, I seem to watch porn with a sort of detached, scholarly interest rather than sexual arousal (not that it doesn't turn me on, a little me-time is generally necessary after watching). It's like, 'So THIS is what they think people want to see?' followed by, 'Oh, that is so unrealistic, he would never last that long!' and, 'Wow, those noises he's making are pretty over the top, sounds like he's faking it.' I have very specific tastes, and way prefer amateur porn to the pro kind.
I can like gay, straight or lesbian porn if it's well done, but for the most part I find straight porn to be the most boring and repetitive. Girls in straight porn are mostly dolls, blank and simpering and dull, so on the rare occasions where I feel like watching girls, lesbian porn is much more interesting because they're more proactive.