Who cares if she is? She's just a person who wants to make music for others to listen to, not have rumours spread that she may or may not be a hermaphrodite.
I don't believe the rumour, since in an interview they ask her about the internet rumours of her being a, "... very well endowed young man," and she replied with, "Well, I do have a really big donkey $*^%."
Edit: Not quite sure if I can put some of that, but this is Seriously (Non)TamaTalk so hopefully it's okay. o-o