I doubt porn did it, since he's married

You think married men don't look at porn? What planet have you been living on? If you read their own posts on Reddit, these guys will tell you explicitly, "I discovered my trans identity by watching porn." And, specifically, it's sissification porn.

I've started to become glad that when I was growing up, the closest to porn you could easily get was watching R-rated movies if your parents had Showtime cable.