I do think women and men get turned on by different things. Men are very visual. We want to see. From "checking out" someone walking by to watching porn, the visual leads to arousal for us. Women, on the other hand, seem to be more tactile. Most women I know could care less about say seeing a penis but they actively enjoy feeling it. I've also noticed women talk about scent, which honestly would be the last thing I'd notice. As an aside, the fact that we're visual is why so many stupid guys get caught sending pics of their penis to women; they just don't get that women aren't triggered by the same stimuli.

I also think that porn is relatively utilitarian for a lot of guys. They just want ten or so minutes of video with sufficient visual imagery to get them off.

My last thought is that taste also really dictates what kind of porn people watch. Once they find the style and content that works for them they stick with it.