That doesn't account for the cultural pressure on girls throughout childhood to be princesses, like pink things and cooking and babies and ponies, while boys are supposed to like computers and engineering and guns.

We're still preparing girls to stay home, cook dinner and have babies while the men go out and earn the money.

“Gender-Differentiated Parenting Revisited: Meta-Analysis Reveals Very Few Differences in Parental Control of Boys and Girls”

http://journals.plos.org/plosone/article?id=10.1371/journal....

This nonsense is being propagated by idiots. Nobody is now forcing dolls on girls and guns on boys. The aggression in men is built by evolution. Again, we only talk in averages. There are idiots again who point to aggressive females to try to make me sound sexist.

That doesn't account for choice of degree.