As far as I know, no group in Tamriel is against homosixuality. There have been few instances of it occurring in-game, but I've never heard anyone say anything bad about it. Correct me if I'm wrong.
I'd also like to add to this discussion: what do you guys think the Nordic marriage ceremony would be like? Certainly not tuxedos and white dresses.
It's probably like in the Dragon Age universe, they think it's just a quirk of character or something. Not against it, nor for it necessarily. It's just not an issue.
And about the ceremony, who's going to officiate it? Some Nine Divine priest? I'm not having that. Daedra over Aedra any day of the week. And I doubt they'll have us dress up.