I don't buy it.
Women are accepted to have biological tendencies for wider hips, more estrogen, more fat storage in the front-upper-torso region, smaller than males, etc.
Women are mostly accepted to have biological tendencies for more compassion, more communication, etc.
It is controversial to say women have biological tendencies to be less aggressive, less ambitious toward leadership roles, and less attracted to hard science in favor of humanities.
The difference between these three categories is hardly in their level of correlation (p approaches 1 for all of them), but in how PC they are. If it is cultural, as the authors suggest, they have stumbled upon the most effective population control mechanism in history!
(note: paper was slashdotted; i'm going by the summary and having waded through too many of these types of studies before)