I was mostly poking my head in to answer the question of why you're being down voted, IMO. I'm on the opposite side of your understanding of this research based on a cursory glance (nothing says 'unbiased' like including the phrase 'feminist campaigners' in the conclusion of a scientific publication).
This week's Weeds podcast has some interesting alternative theories based on the results from various Scandinavian countries where they legislated some gender equality stuff and it neither worked out as well as people on the left would like, nor as much of a disaster as people on the right predicted.
Reply to a reply, so I'm out, back to what I'm actually good at, building stuff for other humans to use.