They vary a lot over the years but basically they support anyone being allowed to do anything so long as it does not cause unnecessary harm to anyone else. And what doesn’t does not cause unnecessary harm or very depending upon one situation. So if you are in a situation where you can make sure your children don’t have double unhealthy alleles, you can afford to have sex with a close relative.
Obviously this gets more and more complicated the more you think about it. And eventually it just does not end up working at all.
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