I have two dogs. When one lies down, the other likes to stand over his head so that when the lying dog looks up he looks right into the standing dog’s penis. I tell the standing dog to knock it off, and he comes over to me all smiling (he does smile) and tries to lick my face, because he knows I’m the boss. I don’t let him lick my face and tell him to knock that off too, so he goes back and stands over his fellow dog.
When dogs engage in this kind of behavior it’s mildly distasteful. Seeing people do it is outright disgusting.