Why do you use the word "limiting"? I agree there are many reasons why a man and a woman decide to get married. But the procreation that results from sexual union is the fundamental social fact that motivated the institution of marriage to be created, and is still vitally important to it. Is it not?
By the way, you do know that Israel lets out of the closet gays into its military didn't you?
What's the connection?
No connection with Israel, except there used to be boatloads of posts that out of the closet gays in the military would cause the institution to go down the drain more or less.
The attenuated connection with Israel however is that perhaps folks just have a certain animus and angst about gays qua gays, that colors their thinking and objectivity. And that is their right. We all have our own aesthetic and moral "prejudices." The trick is to try to keep them house broken, and sufficiently leashed, that they don't become unmanageable, more for one's inner serenity, than anyone else, but also to keep the public square reasonably rational and able to cope with divergent prejudices and aesthetic preferences without excreting an undue amount of toxicity.