Yeah, I refused to answer the Male/Female question on my Facebook profile. There are lots of languages you can set it to that mess up when you haven't, though, because they rely heavily on knowing your gender. (Yeah, I set my facebook to random languages for fun. It's sad, I know

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I think an option of 'Other' would be helpful, but at least it uses 'gender' and not 'sex' to ask you to define yourself. I don't think there's any problem otherwise, and I'm not too fussed about it, to be honest. As the article said, you can always do what I've done and leave it out.