From an interview with Paul Irwing:
All the research I've done points to a gender difference in general cognitive ability. There is a mean difference of about five IQ points.Please note that his results refer to means.
... The results of [our] studies were a shock to me. I find prejudice abhorrent. I've always taught sex differences from a left-wing point of view, that women are every bit as good as men. My findings don't fit my view of the world at all.
... People should have equal opportunities but if you want a society where everyone feels satisfied you're not going to find men and women doing the same things in the same proportions. It would help if we recognised that.