Are Nerds Extremely Male?

I find the theory that nerds (currently known as people with Asperger's syndrome) have extremely-male brains hard to believe. I thought nerds were almost stereotypically un-macho.

On the other hand, males are over-represented in nerdier professions. Maybe there's a scale with nerds at one extreme and macho men at the other. If this theory is right, women would be rarely either nerdy or macho simply because they have a lower variance on the NM (a term I just made up) scale.