I don't really care. I can usually tell by the way they write or the style the signature is done (Eh... don't ask. I'm bad at explaining.), and if I can't figure out by that then I'll assume they are of *insertgenderhere* gender based off my guesses and get on with life. Sometimes I'm wrong, sometimes I'm right. And if I do figure out that they're of the opposite gender, I just switch my thinking of them.