Haven't gotten to marry a character off yet, but my main is probably gonna marry another woman. Because I can.
Also, to whoever said that gay/queer people will play a game whether its gay-friendly or not... actually, no. Hardcore gamers might, but more casual ones, who can choose between games, will pick the one that is actually friendly to them. I know a lot of people who will avoid playing games where the PC is a straight white man by default, or where you can only create straight white characters. Or where the women characters are drawn really sexist or sexualized. It's more of an issue than you might think.
The great things I heard about the options for customizing characters - including same-sex marriage - is actually one of the reasons I went ahead and bought Skyrim to begin with.