'Cmon now. Skip the prejudices, which undoubtedly still exist. In the end it's got nothing to do with brains or ability or will or dedication, but a lot to do with biology. Most women (and men) want to have children. However PC and supportive the partner is it is the woman who get pregnant, carries the baby, gives birth, lactates and is the most important for the first years. A baby's primary bond is to the mother, not the father.
I hate the hackneyed pilot/surgeon comparison, but the M:F proportions are nearly as skew with us as with you and for much the same reasons. Very long training, a lot of time away from home, endless exams, unsociable hours, on call and out at night and active surgery isn't the same as being a GP. Once you're on your way up the ladder it's hard to drop out for the minimum 2 years, regain proficiency and restart the climb and it's even harder to do twice or even three times.
I know several really top class women cutters, but most have chosen not to have have children and those who do have a husband with a quieter job and an extended family support system.