I'm sure there are problems with many hiring process and work environments that result in fewer women in those positions, However, where do the other 50% of CS degree-holding women end up if not in entry-level software jobs? If they have a greater tendency to go to graduate school or to take jobs that make use of their degree but don't fit the cookie-cutter definition of a software job, that's not a bad outcome.

My impression is there are a lot of programming jobs where having a terrible work/life balance is expected. I'm a man and I would avoid such jobs. Perhaps women, including those who earn CS degrees, are statistically more likely than men to feel the way I do about work/life balance. The result would be fewer women working in the field without the environment being sexist or discriminatory.