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[–] VoatsNewfag 0 points 1 point (+1|-0) ago 

Here's a wikipedia article about incest in the middle east: https://en.wikipedia.org/wiki/Cousin_marriage_in_the_Middle_East

Take a look at the prevalence map in that article. It's not "slightly" more common, in some places the majority (!!!) of marriages are among cousins. This happening over generations is probably not healthy.