Well that depends; did his first sexual experience involve him being anally penetrated and humiliated? More importantly, are we talking about a first sexual experience for him that was in fact molestation and rape or are we talking about a willful and deliberate experience of a young adult? Those are two different things. The first being rather serious, of course. I won’t play Dr. Freud, but I will say that early childhood experiences can inform part of our sexuality/sexual identity and that a fetish can be born out of past trauma – the wrestling with and trying to control a past shock or wound.
But let me also say this critical part: if your man is 100% comfortable with his sexuality, that is to say he isn’t concerned with what he likes or obsessed with trying to uncover why he likes something -then who cares. I truly believe that. This doesn’t mean he shouldn’t work on healing wounded parts of him, but if this specific ass play and humiliation routine is an enjoyable and stress-less way to express his desire- more power to him.
What’s important is not if he’s 100% hetero, but that he works to be 100% emotionally healthy. That may or may not include you guys looking deeper into his butt. Dig it?