re: Gay Marriage Spinoff: Where should the new line be drawn on marriage?

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But what if they're related? Like two female cousins or even sisters?perhaps a male/female union between close relatives? Should they be allowed to marry?

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I think they should. There is absolutely no legal ground for not allowing incestuous marriage and the idea that incest leads to grave genetic disorders has been largely debunked. The only thing not allowing close relatives to marry is the "yuck" factor that has permeated our society over the years. The U.S. is one of very few jurisdictions in the world that largely prohibits inter-family marriage.