Or maybe because today, thanks to the IT revolution and the riches it has brought, it is an extremely stressful, competitive, high-stakes, insecure environment that prevents people from having "work-life balance", and that women don't take to that the way men do. There is more to a job than just the core subject.

Other science fields like physics, math, chemistry, biology, engineering are less so, and so overall are more attractive to more women, although still not as much as the other alternatives like medicine, law, accounting, etc.