I don't know myself, but I enjoy sucking and tweaking nipples on big guys with big pecs, etc. However, titty fucking a men - i haven't done that, nor with a fat gay dude either. I see str8 men doing that with women, which is cool between hot breasts/titting - to me, hot-dogging a hot gay man's ass/buns is the same technique for me like women breast titting, eh?