"Traditional marriage is defined as the union of (1) two people of (2) opposite gender," he observes. "If, as advocates of gay marriage insist, the gender requirement is nothing but prejudice, exclusion and an arbitrary denial of one's autonomous choices," then "on what grounds do they insist upon the traditional, arbitrary and exclusionary number of two?"
Here's the answer. The number isn't two. It's one. You commit to one person, and that person commits wholly to you. Second, the number isn't arbitrary. It's based on human nature. Specifically, on jealousy.
"Fidelity isn't natural, but jealousy is. Hence the one-spouse rule. One isn't the number of people you want to sleep with. It's the number of people you want your spouse to sleep with."
"Gays who seek to marry want the same thing. They're not looking for the right to sleep around. They already have that. It's called dating. A friend once explained to me why gay men have sex on the first date: Nobody says no. Your partner, being of the same sex, is as eager as you are to get it on. But he's also as eager as you are to get it on with somebody else. And if you really like him, you don't want that. You want him all to yourself. That's why marriage, not polygamy, is in your nature, and in our future."