O.T.I.S.
Veteran
Either that or dude must be half dog/puppyBecause he doesn't want a woman to let him do it. He wants to violate them as it gives him power and emboldens him that he can get away with it.
He is a sexual deviant and this type of paraphilia will progress to physical touching eventually.

“Dogs sniff each other's butts as a primary form of social communication and information gathering. This behavior allows them to gather detailed information about another dog through scent, including their identity, gender, health, mood, and even their recent activities.”