Er, Little Brother,

You are wrong. But I mean that in a non-attacking kind of a way.

Here's what I mean: As long as women want to have children and men are willing to donate sperm (either through sperm banks or by "direct deposit": straight sex), the human race can survive without any opposite-sex marriages and even without any straight people. If everyone were gay and married to other gays, but they were also willing to endure straight sex outside of their marriages in order to have children, the species would continue.

In fact, marriages are not necessary at all to the perpetuation of the species. No other animal species gets married at all, and few of them are even monogamous, but many of them manage to stick around.

I take that back. Some members of other species are married. I know a dude who went to vegas and had his cat married to his dog. I wonder if they'll adopt?