Don't ask me why (some kind of left-over primitive ape-man instincts), but I'd love to stick a  finger down in that delicious crack and rub the dirty little butthole hidden in there, all the while stroking my cock. When I felt close to cumming, I'd move around in front of you, my cock now level with your face. To send me over the edge, I 'd bring that dirty finger to my nose so I could smell your bottom on it, causing me to absolutely shower your face with my hot cum. Weird but true. Men really are dogs I guess...