I do, and I've been approached by other guys who want me to (which...I don't really feel like doing outside of some kind of relationship).
I started because I like having a dick, but dudes have a lot more to gain re: prostate stimulation (I find receiving anal to be booooooooooring, but nobody would be surprised if I were the receiver in a hetero relationship, neh?)
@KyotoAngel: What does sexual orientation have to do with it?