I think it's more that females are hot. So...yeah...
It would depend, imo. The one girl I know that I suspect has NVLD/Aspergers like me, it's very interesting. She dresses very well, is very well groomed, all that stuff. I at first just thought she was a kinda aloof girl. Lots of hot girls tend to be kinda aloof, so I didn't think much of it. Then, later, as I got to observe and know her slightly better, I started seeing things. Basically, she acts exactly like I do, just she's a girl. She's attempting to learn to figure skate like I am, even though we're both a bit too "old" for it and we both just show up and don't use a coach, etc. That, and I tend to appear very aloof, too. Lots of stuff. But yeah, it's only after getting to know and observe someone for a while and become intimate friends with a person, that "true colors" sorta show.
One thing I will say, I learned a few years ago, how to like, dress well, sorta. Basically, my strategy is, wear the preppiest name brand clothes I can. I just buy random name brand stuff at Salvation Army and sorta throw it all together. I also found out tighter clothing to a point is better looking on you than super loose stuff like I used to wear. That, plus basic grooming, and then later on, working out, solved lots of my social problems with random people. Why? Because I appeared normal. Or at least somewhat normal. To an extent, the clothing and all that "cured" a lot of my social issues. It gave me more leverage, because regardless of lack of eye contact, monotonous voice, whatever, I look the part of being normal. It's just when people get to know me, that problems develop, so how to "solve" that is just don't get terribly close to people.
Anyway, my point is, this girl sorta plays the exact same strategy as me. It "works" but it doesn't. It doesn't solve the underlying issue, it's merely a skin. It's like how I had a skin on Windows 3.1 to make it look like Windows 98. It's still Windows 3.1. But, if you're not very observant or you're just using the computer quickly, you'd probably be none the wiser that it was 3.1. If you were to have to use that computer for a longer period of time than like 10 minutes, though, you'd be like "wtf is this?" And it's the same way people are with me almost always.
As far as girls seeming normal, well, again, girls are hot. People overlook any Aspergers tendancies, or hell, even like them, if you're hot. Sometimes the aloofness makes you seem even more desirable and hard to get.
I think the main thing, though, girls with Aspergers, culturally or whatever it is, seem to have less of a tendency to be basement dwelling losers than do guys with Aspergers. There's a variety of reasons behind this, including feminism and all that, but that'd be another bunch of paragraphs by me. That, and girls who are basement dwelling losers are quite popular among guys who are basement dwelling losers, as the ratio of them is not 1:1 by a long shot. So they marry and live happily ever after (as least as much as normal people who are married, which is to say a 50% chance of failure, woohoo.)
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So, outline of my post. Girls try harder at being normal. Girls tend to not be basement dwelling losers. Girls are hot. That's about all, fulfill those requirements, and yes, people will think you're normal with 5 minutes of looking at you.