I'm for gay marriage. If I wasn't, then I'd have to be against all marriage, at least I think so.
And here's just a little idea to reflect on for people who think that gay marriage is unnatural - People aren't born married. It's not as though as soon as you turn 21, you and your partner sprout matching rings and your houses homogenize. Marriage in itself is a construct of humans, so why is gay marriage any less natural than the more accepted kind?