Well, doesn't even have to be specific, I don't think many of us feel the need to advertise MtF FtM type states, but it would be nice if there was a gender neutral option;
Rather than clarifying gender, my concern is more with, I personally a lot of times go into profiles to see what pronouns I should use, and it'd be nice for anyone else doing that to be able to see if you prefer neutral terms.
On my profile, I see an option for "(unspecified)".
That just means you didn't want to select one, not that you're gender-neutral. That always just leads to people randomly guessing your pronoun for you;
Nevertheless, you'll notice that's the one I have selected, by the complete lack of gender listing in my profile.
In other words, if you're Androgyny, you're not good enough for a listing- right? :X
Or maybe, too good for it~ ^.^
Still, the point isn't how awesome Androgynies are, or even declaring your gender, but solely an issue of how confusing pronoun selection can be without a third option [most sites simply put 'Other', fyi, thus also covering any MtF, FtM, or genderfluid individuals that don't want to declare a single gender].
Separate names with a comma.