Neat thread, sans the arguments.
The thread may be quick to analyze -- but the question was also raised, "Am I weird?"
I guess the thread was asking for an analysis, is all. 
I don't think there's anything wrong with you if you don't allow cross-gender roleplay.  I think that if you want to cross-gender roleplay, it DOES hint that something MAY be a little off about you.
That being said, I'm a guy, and I prefer playing female characters.
That ALSO being said, I don't like playing them at the gaming table.  I'm male.  I sound male.  I don't go for high appearance female characters, but still, it's just tough to play, and I think sometimes it takes away from the experience more than it helps.
I've mainly found that there's INCREDIBLE resistence when you try to get someone to play a female character who REALLY doesn't want to play one.  And why shouldn't there be?  If you're not going to have fun playing a character, don't do it.
Anyway, I don't know if you're "weird" for not allowing this, Destan.  You might be.  But who cares?  You shouldn't feel bad about it, your player obviously doesn't feel bad about it, and that's just how it is for you.  No biggie.
I can't say there are any fundamental differences in "guys who wanna play girls" as compared to other gamers -- but to me, and the ones I know, including myself... you can just tell, you know?  It IS a little strange to cross-gender roleplay.  It's even a little more strange than roleplaying in the first place. 
