Alright so men humping men is a sign of masculinity? Since when did you believe homosexuals were masculine? It seems now you are advocating it as a form of establishing dominance. That's not why dogs do it anyway, it's purely sexual.
its like when a guy says "suck my dick bitch". dogs believe "haha u r my bitch thats why u let me hump u like this. I am dominate over u" and some gays are masculine. For example, prison inmates. Thats why some guys tea bag other guys.