If two consenting adults want to get married, unless I'm one of them, it's none of my business. I shouldn't get to have a legal opinion on it. I certainly shouldn't be allowed to stop it. There are plenty of heterosexuals that I think are unbearably icky and should never be allowed to be naked, let alone to propagate, but I don't get to legislate other people's love lives just 'cos I find 'em icky. And this is as it should be, and furthermore, I don't lose sleep over it.
See, I have a life. Not much of one, admittedly, but I have hobbies, and friends, and marginally marketable skills. Because of this, I have a whole myriad of things that I can be doing at any given time other than worrying about the love lives of people I don't know, let alone attempting to control them. If you spend a great deal of time worrying about the love lives of people you don't know, and are not an advice columnist, you undoubtedly need to get a hobby.
I suggest stamp collecting.
* Which prompted an amusing conversation between James and I--
Me: "Dad wrote me an e-mail. He talked about gay marriage and Leviticus. He's against it."
James: (startled) "Against gay marriage?"
Me: "No, against Leviticus."