An entertaining book, fine for a bathroom or train read. As mentioned by some reviewers already, this is a mixture of scientific studies on brain differences between men and women and the author's freely interspersed anecdotes, opinions and observations. A critical reader should be able to discern which is which.
I found a number of outright errors in the book. For example, "There are many more left-handed women." In fact, about 10% more men than women are left-handed. I also found innumerable sweeping statements like the following.
- "Until recently, women tended to be pregnant most of the time."
- "80% of all human societies have been [promiscuous] for most of human existence."
- "Until the introduction of the contraceptive pill in the 1950s, no-one noticed that women had emotional highs and lows."
- "Throughout human history, wars greatly diminished the numbers of men...so creating a harem for the returning males was an effective survival strategy"
- "Girls were a disappointment because the tribe invariably had an excess of females. This is the way it was for hundreds of thousands of years."
Unsubstantiated, unsubstantiatable, or just plain wrong. I mean, do we know how homo erectus greeted the birth of a girl? War may have diminished the numbers of men during specific time periods, but I think one could certainly make a case that childbearing had a much greater effect on female life expectancy than war did on male life expectancy. I haven't seen any anthropological references to modern hunter-gatherer groups with harems. What is "promiscuous"? Where are these societies? Who counted them?
I also found objectionable the running thread of "man the hunter" and the faulty logic that connected all male behaviour to this one supposed fact. Why, for example, do men need distance vision to hunt, but not peripheral vision to watch for predators? Men just want to have a "few pelvic thrusts" because they must always be on guard against attack. Primates living in the wild seem to have time for courting behaviour, even with watching for predators. And, wouldn't the women have to be on guard as well in this relentlessly hostile environment? Why aren't a few pelvic thrusts enough to satisfy them?
While it was sometimes amusing, and the brain research material was interesting, I found this book more irritating than enlightening.