This seems kind of obvious to me honestly. Like if you weren't worried that you would 'turn gay', why would you give a single shit about what other men do in their bedrooms? It just goes to show how even in our 'enlightened' age that there is still a terrible stigma associated with being gay among certain groups. Ignorance and fear is part of it but religion plays a big part as well.
I have a friend who 'admitted' to me that he was gay as if he were telling me he was a pedo or a murderer. Of course I told him that I dgaf, but it mattered to him. He's a devout Catholic and has been tortured by his sexuality since before I knew him (30 years). He has even enrolled himself into a coupe of those 'Pray the Gay Away' camps. It's amazing how willing people are to follow a God who would put them through something like that.
I used to work with a religious guy who started this whole "Homosexuality is a choice" bit. I said "You think you could just choose to be gay?" and to his credit he admitted that he could. He's more honest than a lot of closeted homophobes, usually that question makes them backtrack their position, but he's to devout to realize that homosexuality isn't always a boolean and he didn't have a choice in his sexuality anymore than my friend had.