This wasn't addressed to me, but I have to say I don't quite agree with the responses.

Ignoring its trivial impossibility, I'd believe such a woman was (at least in a romantic sense, and probably in a non-romantic one) very naive and very socially awkward, or that she was a lesbian. As I understand it, it's fairly hard to be a woman without encountering at least a few men, so if a woman totally lacks any male friends in her entire social network, that would signal serious, debilitating shyness, a lack of social skills, or a lack of interest in men. Of course I'd change this belief in the face of any contradictory evidence, but absent further evidence, that's what I'd infer.