This seems a strange view to me, even here in the West, where everything seems to have gone a bit weird around sex. Nobody does it any more, everybody seems to overthink it, coming up with strange theories about it.
Adults fiddling with kids, is adults fiddling with kids, always wrong, always unacceptable, for sure.
Anal sex between adults is just anal sex between adults, it means nothing more, it isn't driven by any kind of subiminal drive to fiddle with kids, or even any drive to be homosexual. I've had more than one partner who loved it, and she used to teach her kids about it, so one day they might enjoy it too.
Animals do do it, though probably mostly by accident.
Also there are nerve systems there, in both sexes, hence the reason why it's fun.
I am not gay, I don't fiddle with kids, and I don't know any relatives who did either.
In the countries I've visited in South America it's normal.
They even sing songs about it - happy mischievous songs.
I have a twenty year old daughter well educated on everything she needs to know too.
It was a heterosexual woman who taught me most about it, A woman from South America, but I know in France, Italy, Spain, All the Arabic countries, Africa, it's normal.
Only here in the West do we seem to have issues with it, and actually sex in general.