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Testosterone

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Chief Makwira and his wives, Malawi, 1903. Older men had first priority. Younger men could gain access to women only through war or adultery.  Credit: Wikimedia Commons
In my last column, I reviewed the findings of Butovskaya et al. (2015) on testosterone and polygyny in two East African peoples: - Testosterone levels were higher in the polygynous Datoga than in the monogamous Hadza. This difference is innate. - Datoga men were more aggressive than Hadza men on all measures used (physical aggression,... Read More
Hadza men are smaller, less robust, and less aggressive than the more polygynous Datoga. Credit: Wikimedia Commons
Humans differ in paternal investment—the degree to which fathers help mothers care for their offspring. They differ in this way between individuals, between populations, and between stages of cultural evolution. During the earliest stage, when all humans were hunter-gatherers, men invested more in their offspring with increasing distance from the equator. Longer, colder winters made... Read More
The ratio of index finger length to ring finger length provides an index of sexual differentiation. Credit: Wikimedia Commons
Are men and women more alike in some populations than in others? It's possible. First, boys and girls differentiate from each other to varying degrees during adolescence, and this process of sexual differentiation is genetically influenced. There are even conditions, like Swyer syndrome, where an individual is chromosomally male (46, XY) and yet develops externally... Read More
Extraversion is part of the male toolkit for mating success. It is especially useful in societies where a high incidence of polygyny means too many men must compete for too few women. As a single man, I would spend close to $3,000 a year on dating. And that didn’t include things like buying a sportier-looking... Read More
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