I am totally fine with same sex marriage, in game, in real life etc. Doesn't bother me a jot.
To allow same sex marriage in the game means it would have to be somehow inserted into the lore of the game. Again, this doesn't bother me.
However, what a lot of people in the English speaking forums fail to realise, is that this game is a world-wide game, which spans many different cultures who are far more sensitive to this idea. The majority of people who read/post in this thread are liberal 'Westerners' (read: Europeans/USA/Canada/Australia etc.), but we do not represent the entire 100% demographic of the playerbase.
My point? Just because a lot of 'us' are fine with the idea, doesn't mean that a lot of 'everyone else' is fine with the idea. We can't impose our cultural beliefs on people on the other-side of the world just because we think they should accept it, in the same we they can't impose their beliefs on us and assume we should readily accept them. Thus, we reach an impasse.
Ultimately, this is a game, and has no real affect on your real life. If you want to be married in real life, i very much support your claims to same-sex marriage. If you want to be married in a virtual world, find one that will let you do so. Real life example: Two of my lady friends were not satisfied with the idea of a 'civil partnership' in the UK, so they flew to New York to get married. That took some real dedication. If you want it that badly, find a virtual platform that will allow it.
I am not trying to suggest that you stop asking for it here, but remember you are not the only culture who exists in this virtual community, and SE are likely going to play it safe for a long time. So don't be disappointed or take it to heart if it doesn't come to fruition any time in the near future.