There are plenty of Christians who think homosexual activity is totally fine.
I think if you surveyed those Christians who are opposed to homosexual activity, their reasons why they were opposed would vary. A lot of them would probably just say "it's a sin, because the bible says so", without having given the subject much further reflection.
What I'm getting at here, is that your idea that homosexual activity is not "in the interests of the doer" is quite a specific claim that I don't think is necessarily believed by the majority of Christians. It implies you might have some specific reasons why it's not in the interests of the doer. In my experience, most Christians who opposed homosexuality don't have any such specific reasons, but rather have the general notion that "it's wrong, cos the bible says so". I tend to find that if they actually sit down and try to think about specific reasons they quickly become much more supportive of gay rights because they quickly realize that there aren't really any good reasons to be anti-gay.
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