I've mentioned this before but it merits repeating. I do not want to see a chick licking some guy's asshole. Sure, it's great when it's my asshole, but when I look at a chick licking a guy's asshole, I'm forced to look at some guy's hairy asshole. Why the fuck would I want to do that? Thank god for the fast forward feature.
I feel the same about old guy, young woman porn. Being 50+ and needing to lose 30 pounds I can identify with the slob fucking the sexy thing but I don't want to watch it.