Seriously, do we need to promote the stereotype of "don't believe someone if they say they are a girl". Better advice, say "cool" when someone says they are a girl, and otherwise ignore it.
In a sort of case/point, the most famous female on freenode, imho, is Christel http://blog.simplychristel.net/ the person that took over for lilo (when he passed away) on freenode, not including the other FOSS projects she's involved with.
I don't think I would insult her (and myself) by suggesting she isn't female, nor would I insult her (and myself) by 'throwing' myself at her.
She (and any other woman) should be respected, by the same standards you would respect a male.