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The government does not pry into such details, but the reason why marriage historically consisted of a man and a woman is that they reproduce together. Why are marriages of cousins and closer relatives banned in the U.S.? Because society does not view certain couples as proper reproductive units.

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That dosesn’t answer my questions though. You are against same sex marriage because they don’t form a reproductive unit. Infertile people don’t either. By your logic, they shouldn’t be able to get married either.

Also, cousin marriages are allowed in about half the U.S. states. A few states that allow it actually require one partner to be infertile - proof that the government does pry into such details.

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