Recently, however, I guess facebook decided to address this oversight. Today when I logged into my facebook homepage, I received this message:
I can't imagine what they hope to accomplish by this. I don't think that most users will react with "Oh thank god, now my friends on facebook can know what gender I am, I can't believe I forgot to fill that in." There are many users like me who find Facebook's sex & sexuality options limited. I actually use the SGO application to put a box on my profile that's more informative, and in that box, yes, I do identify my sex as female. But that's hardly the point. I generally identify with "not otherwise specified" and I feel I have a right to straddle the line, if I please.
So luckily, you'll notice, facebook prompt has a third option, which is the one I'll be picking. It's "close".
Update: I've made a facebook group encouraging people to switch to an unspecified gender. This should be interesting...