Thanks to Solitaire Miles for sending me this item from the Telegraph. According to Satoshi Kanazawa of the London School of Economics and Political Science, intelligent men are more likely than the general population to remain faithful to their mates.

Kanazawa told Telegraph writer Matthew Moore that he thinks this is because in primitive times, it was adaptive for a man to father children with multiple women; now that this is no longer adaptive, only more intelligent men have the ability to " shed the psychological baggage of their species and adopt new modes of behaviour."

I disagree -- not about his finding about the correlation between intelligence and monogamy. My understanding of the research by Thomas Insel, Larry Young and others is that the human brain is structured like those of the other 3 percent of monogamous mammals. We have more oxytocin receptors in our brain's reward center, causing us to tie the reward of sex to an individual. 

This is social monogamy, not true sexual monogamy. That strong bond with a mate doesn't preclude that monogamous 3 percent from sexual activity with other individuals. In prehistoric times, this let human males have the best of both worlds: investing substantial resources in the survival of his mate's children while spreading a bit of his seed around at random.

In today's structured and complex Western societies, most of us expect sexual monogamy within marriage. Perhaps it takes a bit more brain power for men to resist the lure of extramarital sex.

By the way, Kanazawa found no such correlation between intelligence and sexual monogamy in women. What does that mean?