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.
I found a short article about the viking attitude about homosixuality, I'm not going to link it, it was somewhat graphic, but apparently it was very passive much like it was in Roman culture, but it usually occurred in a violent way, or in a Master and Slave relationship to show ones dominance over another male. I would think TES Nords would be less concerned about gender roles though, and it would be present in a much more healthier relationship.
About the ceremony, I would think it would be a family gathering with an elder or parent giving them away. I'm not sure how it would be handled in the game though...