Some members I get so wrong, I read them as very male and they turn out to be women. Others I read as female, and it turns out they are male. And some, I read as male, they claim they are female for ages and ages, and then it turns out they were male all along
I think avatars with newer members does this too. Once you get to know someone a bit more it seems more obvious...obviously. But I do tend to assume that those with male avatars are male and such, even when the avatars are of BB contestants.