Regarding the general lack of sixuality in the TES series, I see the point and I partially agree. However, part of what made NPCs seem so generic to me in Oblivion was that all characters seemed to have interactions with no one but the player. In Morrowind and before, this has mostly been due to technical limitations, and in Oblivion I have a feeling that the AI coding had a lot to do with it.
Social interactions, and that includes romantic ones, are such an integral part of human life, and, an open-world epic RPG seems a lot less real, at least to me, when there's a complete lack of NPC relationships and interactions (whether they be friendly or romantic.) I may be optimistic, but I expect that to change in Skyrim. That image of the bar maid, for instance, I don't just see a vast improvement on body and face models; I start to imagine her being married to one of the blokes behind her, and when not in conversation with the player, their conversations and interactions will show that.
EDIT:
I'm not a fan of it. It wouldn't be done subtly or tastefully, so it would just be strange. Plus, think of the awkwardness if someone was watching you play when a gay character starts coming on to your character. Just imagine it...
This is sort of verging on something that could evolve into off-topic and real-world discussion. Please don't elaborate, and please, if anyone else finds it offensive, don't reply.