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| The Bacon GuyInstinctive revulsion to an act which threatens your species’ gene pool. This trait would preserve the genetic fitness of an individual's offspring and therefore be perpetuated throughout the generations until we have a near-universal "yuck" response to the idea of incest.
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Historically incest has not only been acceptable but among royalty a must. We can thank christianity for making it unacceptable and giving it the yuck factor.
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The only genuine reason incest is treated differently is because of the instinctive revulsion people have towards it. The issue of genetics is a red herring thrown in to try to rationally justify this revulsion and therefore make banning the practice of incest seem more palatable.
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Agreed the genetics is not an issue, the revulsion is.