The desire for a sex act, with whomever and whatever, is completely within our own self-control.
Men who desire anal sex with other men do it because it feels good to them. They enjoy it, they relish it, they want more and more. They want the lifestyle, they want more partners, younger partners (for obvious reasons).
It is very simple really.
And over the decades they have been mocked and condemned for their desire (to keep it from spreading)...and in the few places that it was encouraged, it profligated (bathhouses) and they began dying by the thousands from it. Since this was an indulgence by wealthy and elite homosexuals...they then countered their destructive and deadly behavior with a claim of political victimhood status.
Once they achieved political victimhood..they wanted more, they got an unprecedented boost from Hollywood, newsmedia, Academia, and pols for their propaganda to reach our children and citizens, and it has been all downhill from there.
We are now at the point that a 13 year old boy decided to commit suicide this year, because his culture, school, and possibly his parents had convinced him he was “gay”. (would they all have done the same if he had been caught smoking? Never!)
This is sick and dangerous, and the days of pretending this is an issue of simple tolerance towards other human beings are over.
But there is such a thing as "obsessive compulsion", which is a psychological phenomenon. People are compelled by emotional needs, regardless of their source, to repeatedly do things they know to be unwise, unhealthy, or simply unsatisfying. At that point, they can choose (free will) to either resist or give in. Most give in because they lack social support mechanisms that might help them resist their urges or psychological counseling that might help them understand and control their compulsions.
Worse, there are cases such as the one you cite, where the young and vulnerable are manipulated for the political or personal ends of others and offered poison in place of medicine. I'm convinced there's a special circle in Hell for people who prey on the innocent.
Homosexuality exists in many species as a matter of autonomic compulsion in the absence of suitable opposite sex partners. That's not the case with people, who unlike other animals possess voluntary consciousness and reasoning ability. And yet, those unique abilities may be overcome by inexplicable need. They simply cannot help the way they feel. I've seen three year-old boys instinctively pick up toy guns. I've seen others pick up their older sisters' makeup kits. It just happens, and there's always a reason, but chances are: you're never going to know. They're all human and they are all God's children. Whether they belong in the Army is another matter, entirely...