^ Oh come on now. He's asking about favourite positions when it comes to gay sex. He's not claiming that position is exclusively gay.
Anyway, I'm gonna be boring and say doggy. It just feels the best, especially when I bottom.
Anal missionary is fine when I top, but when I bottom, it doesn't feel great for some reason.
Cowboy/riding doesn't work for me when I top, possibly because I almost always sleep with men that are heavier than me. When I bottom it's fine, but I prefer being slammed over having to do all the work myself.
I do variation to the above positions, but anything radically different just feels like gymnastics to me.