You have taken the argument to an absurd conclusion. You ignore what I've said about consent and legal contracting. You just can't acknowlege the ignorance of your conclusion. I have nothing new to say on this issue.
As for other adults. Let me first say, that I don't believe government should give out marriage licenses. BUT since it does...............
The governement should justify why certain licenses should not be granted. It is not up to taxpayers to justify their way in.
Your concern about incest is veru touching. My reading says that adult-adult incest is rare. In fact, it's hard to find research because of the lack of significant survey populations. Ig you don't want to allow this type of marriage make your case and go for it. I have no particular interest in this issue and I don't think it's much of a problem.
Everyone here rails about polygamy. Not a big fan, I've had my hands full with one womnan at a time. Unless we run out of mates for one side or the other, I don't see the problem with polygamy. Other than the fact that you don't like it or think it's immoral, make a stronger case and I'll consider it. Again, the government should have a solid reason for not allowing it other than the majority thinks it's bad or icky.
As for homosexuals, who cares. It doesn't affect my marriage and it may be healthy if it decreases promuoscuity. All this ranting is overblown for my money.
There's no more reason for that than there is to require them to be male and female.
Requiring them to be male and female is fundamental to the definition. If you can't see that, your favorite word "ignorance" doesn't apply, but blindness certainly does.
And the real issue isn't that so many of them want to be married anyway. The real issue is they want to use the courts to force acceptance of their disgusting behavior down everybody's throat. There is no more reason their perversion should be legally protected than any other.
Practice it in private ? I don't care. Make me say it's good, moral, a lifestyle to emulate, that it doesn't harm the practitioners, that children raised by such folks aren't handicapped - no way. Two plus two does not equal six.