Jace you miss the point. Incest reslts in demonstrable risk of birth defects...it is a health issue. Gay marriage is not. You are mixing apples and oranges. And BTW before you ask I have no problem with polygamy.
So far I found Jace's points ridiculous.
BUT: The health issue doesn't apply. You could make incestuous sex illegal and still have incestuos marriage legal.
Anyway, why would somebody want to marry someone closely related? Well, this is a dead end way of discussion.
