The argument has been made that the State should not be involved in marriage at all. This is BS. The State should indeed be in the business of maintaining stable, healthy family dynamics. and little Sally growing up with two Dads is not a healthy dynamic. Allowing children to think that homosexuality is in any way "cool" or appropriate is analogous to letting them think that smoking is "cool" or healthy.
Smoking gives you severe medical problems. Homosexuality likewise gives you medical problems (men who take it in the can often wind up wearing a bag in later years), not counting the AIDS and HIV that started in their population before moving to the Straight population by going through the Bis first.
Aside from that, you have the emotional turmoil that homosexuals live each day, knowing that they are outcasts in a society that does not, and never will, accept them. It would be far better for them if they just strove to be happy in a straight relationship or, if that is not possible, then gave their lives to G-d in the holy sacrifice of celibacy.
No, I am not one of those who believes in "Pray the Gay Away", or hormone therapy. I think that both of those usually wind up in causing further emotional damage to the gay person, and in the latter case, possibly physical damage as well.
But I do believe in self-discipline and self dignity. Just because you are minded to do it doesn't make it dignified. A person might be minded to look at porn. That doesn't make it ok to look at the stuff. There are all kinds of things that people are minded to do that don't have any moral integrity to at all, and in fact may be morally bankrupt. So the fact that they are morally minded to do those things doesn't make those things right. Homosexuality is just one of those things.
***EDIT***
We are having a similar conversation at the other site. This was my latest contribution there. Tom, you keep right on going my man!