It has been my experience that the farm boys and girls of any culture have a pretty good idea what's going on. Gummy mentioned to me problems with Arabs of the city variety and sex. But I bet the Bedouins don't have those problems.
Surely the people of the bible didn't know modern biology, but as PH says, the basics were probably well understood. And I think they realized that if you had a nose like a macaw, you'd likely visit that affliction on at least some of your children.
There is a Christian view. I think we might not afflict our kids with our own hang-ups.
Parking your brain at the church door was never a requirement for any faith that would have respect. Blind faith in horoscopes, psychics, faith-healers, magnetic bracelets, feng shui, ghosts or satanic demons is not something responsible parents impose on their children.
Unfortunately, there are a lot of irresponsible parents who inculcate cultish notions on their kids.