Technically speaking, yes. But keep in mind that this is also the magical world of GameA, where anyone you choose can magically become a different gender, race, ethnicity, religion, etc., just because you wish for it! Everybody...IMAGINE!! Ha, ha, ha!
It's true that I don't use any of that stuff. But I don't see how it would technically prove a person's gender. I mean, sure you could show pictures on FaceBook or whatever, but then people could just say, "You photoshopped that!" or something. That's why it's better to either just take someone's word, or use your imagination. It's all cool. :)