That's an interesting point since in practice, athletic ("jock") women tend to be more common than nerdy women to begin with. Women being into tech or science (stereotypical "nerdy" pursuits) is something that tends to happen more in lower-income countries, which suggests a large self-interest or incentive component, while the opposite is true for athletic women. Perhaps the proper counterpart of the "nerd" among women is engaged in very different, more traditional crafts or intellectual interests which aren't highlighted as "nerdy" by mainstream culture.