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

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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.

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Good points. I am personally opposed to incestuous marriage. But like I just said above, I base that on moral rather than legal grounds. From a legal standpoint, now that marriage is no longer limited to only one man and one woman, there is really no "legal" basis to deny the right to marry to anyone who is of age of consent. Simply put, moral grounds or "yuck factor" cannot be used to limit marriage any longer.