My understanding is that most (and I'm sure there are exceptions) of the "gay-for-pay" guys are the ones doing the fucking...so it would seem that a hole is a hole is a hole.

And I remember reading a article in Details about this very subject, and the actor they were talking with said the reason he, as a straight guy(with a girlfriend) was making gay porn was that the $ was/is much better than in straight porn(where guys only make a couple of hundred dollars a scene).