What really gets me about the whole "gay marriage" debate, besides, you know, everything, is that it seems to be based ultimately in the idea that men and women are importantly and irreconcilably different. If a marriage between two men is less legitimate than a marriage between a man and a woman, it follows that men and women must play different roles in a marriage. The genders aren't interchangeable because they're not equal.
In other words, the problem really is "which one of y'all does the dishes?"
(Actually, that's probably only about half of it. The other half is believing that gay doesn't mean "attracted to the same gender," it's an entire "lifestyle" of which same-sex attraction is only one symptom and the others are all different manifestations of hedonism and debasement.)
Something I don't have time to fully pontificate on right now because I have work in like ten minutes: the difference between feminism that describes womanhood as unique and special, and feminism that says women are equal to men because they're basically the same. I tend to fall on the side of equality, because "women's culture is secret and beautiful" sounds a little too much like "ladies have their own role to play" to me. That culture and that role's the fucking kitchen, man. I don't want to be special, I want to have a life.
(Barely related comment: I hate it when people say "if gays can get married, what about polygamy?", not just because it's a dumb slippery slope, but because in my sheltered little way I really want to just say "what about it?" Sometimes a mommy and a daddy and another mommy love each other very much...)