Also, I think that one need to see that Scripture does not seem to condemn incest per se, but condemns incestuous relationships which may lead to confusions involving inheritance. Since inheritance was everything for a lot of people (esp women in the ancient world, without an inheritance they were doomed to prostitution or the hope that some rich guy would marry them before it came to that) anything that muddled that was way off limits (btw, this is also why adultery was such a horrendous crime in Ancient Rome). And, of course, you can't have sex with your own sister, because then she could get herself married off.
Our father is old, and there is no man around here to give us children—as is the custom all over the earth.
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