Dragons are not realistic, and certainly not normal. Even in medieval times 
Yet no one complains about them being unrealistic. Why are dragons, dwarves, elves, qunari and magic exempt from the "realism" argument, but sexual orientation isn't?
Cause sexuality is a mundane thing.
And has little to do with the fantasy.
I do find it strange that the people of Thedas are, for the most part, so accepting of homosexuality. Being gay certainly isn't 'normal' as some people would have us believe, so the fact that they're so accepting of it is rather strange to me, especially when the setting of Thedas, and the Dragon Age universe as a whole, is supposed to be medieval-like, which makes it even more perplexing.
I'm not saying that we should have gay characters being lynched (or something like that) in Dragon Age, but having a few more characters who are less accepting of gays would make the world feel a little more realistic (you can't seriously be telling me that there are hardly any people in the Dragon Age universe who are homophobic).
Someone must've been missing history classes, yea? Because there were times in history when those things were not only normal but expected even. True, it wasn't in the medieval times but who really cares? And it's not that "normal" in DA, not to the point where no one cares or no one mentiones that and such. People just care less because they have more important things going on around than that, that's all. And the Chanty has more important things to preach, too.