I hang out on irc usually. I think only nerds and leechers hang out on irc :) "normal" people are on twitter, msn or some forum. Oh... and if someone says to be a girl, don't trust him :)
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.
You have disrespected them (and potentially males) by claiming that all who claim to be female on IRC are in fact male, and that we should be aware that they are lying. I have no such knowledge that they are... and it simply doesn't matter to me if they are. But I prefer to believe people are honest, and if someone claiming to be a female on IRC is actually a male, it probably won't matter much to me, because I'm not on IRC to date in the first place.
note: the actual male to female ratio is irrelevant.