I find RPG.net's posting population to generally be quite left-wing politically. I don't usually have so much a problem with that except that the attitude seems to bleed into things where it doesn't make any sense...
But sometimes, that place does inspire some thought. The LGBT in Fantasy thread was one such thread.
While D&D is very much a social game, I usually don't play it as a social game, if you take my meaning. So the idea of romance and the problems thereof really don't enter into my games. Usually.
But the players can introduce such things. "My character is gay." Hell, it's hard-coded into the rules. The existence of gender-swapping magical items and traps means that transgendered characters absolutely exist if you're going by the book. If you go by the charisma notes in OD&D or dryad descriptions in 1E, you're going to see that sexual situations aren't supposed to be nonexistent either.
But I see a lot of odd attitudes towards this sort of thing out in gamerdom, from both extreme angles. On one hand, I see people who are uncomfortable with players playing a gender not their own, and an attitude that wishing to play out an interpersonal relationship in-game is somehow weird in and of itself. On the other side, I see people insisting that not only will their characters be gay/bi/trans, but that the game world should accomodate it as well.
(I mention that last bit as an "extreme angle" due to my own preference of having medievalistic campaign worlds, including monotheistic Dark Ages religion, and I don't do romance-as-plot as a general rule to begin with, so what's generally the point?)
Now I've realized a few things gaming here in Finland. People are generally a lot less uptight about many things, and that's put me at a disadvantage a time or two (especially since I'm the one used to being completely inappropriate... :P).
I've realized that I have this campaign world I've used since 1990 or thereabouts, and both campaigns I've run in Finland using this world has been set in the same geographic area... because that's the area that's generally like "here" as far as general social attitudes. Elsewhere are more brutal feudal systems, oppressive dictatorships, and basically a bunch of environments that aren't so suited for your regular D&D game PCs and activities. So when a player wanted her character to be a gay man, it wasn't so much a problem. In the cities you can find most anything, and nobody has to make a big deal of it. (if they went elsewhere, I would turn it into an issue though)
But I do my best to keep all the romance and "I hit on the barmaid/stable boy" stuff very shallow and lighthearted and keep all the results off-camera. It makes me very uncomfortable to deal with this stuff in detail, and especially in-character, in my games because... well, wordplay and such is (or was, when I lived in the US... you should have seen my phone bills, and no, not to 900 lines. :P) such a major part of my real-life "courting" techniques. I don't want to have to make the distinction between doing it for real and for fake. Especially with some of the players I have, ya know? I need to behave when running games.
And I have no idea if any of my current players are anything other than straight-arrows, but I was gaming with a pre-op transsexual during my final days in Atlanta, so the experience isn't foreign to me.
Referees, how do you change your approach to your game if one of your players is not straight? Or if all of them are?
What if one of your male players wants to play a female character, or vice versa? Transgender?
What if one of your players wants to role-play a romantic relationship in-game?
Players, do you ever play the opposite gender as a character? Pursue in-game romances?