Speaking of incest, I recall a HS student asking a priest, in class, how Adam and Eve's sons produced children.
The answer involved ... Eve.
The answer I have usually heard from Biblical literalists is that they married their sisters (Adam and Eve also had daughters, according to Genesis 5:4).
Holy crap. For real? That is horrifying. We have nothing on those Old Testament types. I can’t believe that. Does anyone else know this??????