The Supreme Court of the United States of America (you're heard of them, yes?) has declared marriage a fundamental right on no less than three occasions and by some reports as many as 14 occasions. Now, you are free to disagree with their rulings, but as it stands right now, marriage is a declared fundamental right. Here are three cases you can research:
Loving v Virgina
Turner v Safley
Zablocki v Wisconsin
So, in order to deny this fundamental right to gays and lesbians, you must be able to demonstrate a societal harm in allowing them. Go!
(Sassy claims to be ignoring me so if
NYcarbineer would be so kind to respond, Ms Lass will be sure to see it)