[exomancer]

I think you are also misjudging the effects, and to talk about ability is harmful to the very debate. There are some differences in ability, but they seem to even themselves out (men are better at mental rotation, women have better visual memory, etc.), the total effect on general intelligence appears to be none.

However, there are measurable psychological differences when it comes to preference of the role you want to take, how much risk you are willing to take, and what your priorities regarding status and family are, and we do have evidence that some of it is, at least partially, biological.