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[–] twee 0 points 2 points (+2|-0) ago 

I was about to say the same thing. The law of diminishing returns is why marrying your sister is not better than marrying a foreigner.

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[–] Joe_McCarthy 0 points 3 points (+3|-0) ago 

Yeah, but who puts it in such terms? There is a huge amount of middle area between marrying a close family member and marrying a tribesman from New Guinea. Neither are especially prudent options.

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[–] twee ago 

LoL that's true. But genetically speaking... ;)

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

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