Green Witch and Francis are often right, while data may vary.
Me, I don't care.
Many people at a2k have at least started with obscuring their gender identification, perhaps from some past history, for different reasons.
I picked a name in a few seconds that is in many ways unfortunate but was innocent of being other than about italian food. Whatever, I have explained myself in posts and in profile -- but I understand other people being coy.
Am I talking with Roxxxanne? Probably not, from other indicators.
But, I'll pick female.