This situation is probably the extreme form of instinctive control over mating rights.
By denying potential competitors' access to mates, we hope to increase ours.
Did these people actually read the Bible? "So the two daughters get their farther drunk on wine, rape him, and have his children". Then the Bible moves on to the next tale, like "well, yeah, THAT just happened".
Or see the recent scandal of Jeffrey Epstein and his sex trafficking for first world elites, or Harvey Weinstein and Hollywood's abusive underbelly. Or, closer to the topic here, the allegations of pedophilia involving UK's cream of the crop.
I would be curious how people behaved wrt sex before the modern repressive religions came along.
Very crudely, my understanding is that places where food meant plowing (i.e. heavy work) almost always had a strong marriage tradition. While places where growing food was light work quite often did not -- basically places where it was possible for a woman to raise children on her own labor. (Not very sure about non-farming people.)
My impression is it has less to do with religion itself but rather the culture. China under the CCP is far from a religious culture, but they’ve banned porn for decades.
>Don’t you think people are naturally more private about sex though?
The first rule of Fuck Club: don’t talk about Fuck Club.