As far as your first question...absolutely, your specific friend may value family over career. But looking at women as a whole, are you saying there is something biological that makes them not want to be pilots?

And yes, certainly society dictates things to some extent. % of women in the workforce went from 34% in 1950 to 50% by 1977. Did women suddenly have desires and passions they'd never had before or did society's expectations change, making them more comfortable pursuing those desires?