When asked the question if you could marry the same-sex in The Elder Scrolls: Skyrim, Peter Hines (Bethesda's PR) replied that of course you can, you can marry anyone you like.
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He followed up on that tweet writing: "Sorry, should clarify. Not any NPC, just mean any male of female. Doesn't matter what you'r playing." And of course you can: Bethesda is trying to create a "realistic" world, so a little gay love wont harm anyone. No Westboro Baptist Church not even you. To be honest i didn't even know that you could marry anyone at all, so it seems that there are special characters that you can marry, which makes it a much more interesting instead of this any random NPC marriage. I definitely like the way Mass Effect handles romances as opposed to Fable