I've heard some people say that it would open the floodgates to all sorts of things, including people wanting to marry their cats or their houseplants or their own children. Those are the kind of people that I'd rather not be in a debate with. They don't have the power of reasoning, so I don't waste my time. The fact of the matter is, and they should just start accepting it, gay couples are having children, attending PTA meetings, baking cupcakes for the school fundraisers, taking their children to soccer and baseball games, etc. These wonderfully diverse families already live in the same neighborhoods that most of us do. They're basically living the same lives as so-called "hetero" marriages. The only thing they're not doing is enjoying the same RIGHTS as those in hetero marriages. If anyone's marriage is going to fall apart because we allow gays to get married, I'd opine that the problems of that marriage go way deeper than this issue.