Quote:
Originally Posted by Jinn
and in the case of brother-sister sex, the progeny created by intercourse is very likely to have defects or die before / during birth.
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This isn't true. There is a slight increase in the likelihood of a child born from incest having problems, but the real danger is in repeated generations of incest.
As for the OP, I don't see any clear difference between these different forms of taboo mating. They all have different effects which vary in severity depending on the situation, but overall I think they're no more harmful to society than Big Macs or marijuana.