I just read what I consider to be just about the most intelligent comment on the subject.
Here is an exerpt from the New York Times review of Mommy Madness by Judith Shulevitz (20 FEB, 2005):
That a dearth of women in a particular field leads directly to doubt about their suitability for that field was made amply clear by the controversy last month over whether women lack the genetic capacity to succeed as professors of math and science. Maybe they do and maybe they don't, but you don't need genetics to explain why women might fail to rise to the top of a profession that requires an 80-hour workweek.
[Eugene Volokh] There's No Graphy Like Stega-No-Graphy
13 minutes ago