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Originally Posted by shnicky
Honestly, incest, as for me, is a taboo to those who believe in it. It's pretty much like a society-induced pill. Ethically and morally it is incorrect, society said.
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It's much more than that - it's a biological imperative. Inbreeding is very dangerous in humans.
My sister is a geneticist. She says there's genetic evidence that there was a massive die-off of humans at some point, and that we're now all descended form one small group. Basically, we're already so inbred that any further inbreeding starts causing defects really quickly.
Also, with other animals, you can rebuild a population with only a few breeding pairs to work with. With humans, it takes over a thousand.