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Quote by: Soil 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. |
Social factors can and do overcome genetic factors. That doesn't mean the genetics aren't there or that they're not active in the majority of cases.
And I don't think you can blame everything on Christianity: countless non-Christian societies have taboos against incest. Christian morals aren't generally original; they're simply codified versions of the morals of the time.