When Should Testosterone Really Make a Difference?
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Among animals, there is a species of desert tree lizard, Urosaurus ornatus , that includes two different types of males. 23 The two types differ in their dewlaps, the extensible throat fans they use to show off and communicate with others. One type has a solid orange or yellow dewlap, and the other type has a dewlap that is blue surrounded by orange or yellow. The blue lizards compete and fight to control territory. The others avoid fights and look for unclaimed real estate. Both types succeed well enoughthey survive, find mates, and reproducebut they go about things differently. High- and low-testosterone men, or women, are not as clearly divided into two groups as the lizards, but when all the characteristics that go with testosterone are taken into account, it may not be too far-fetched to think of high- and low-testosterone individuals as two specialized variations on the basic human model. From this viewpoint, it isn't surprising that they tend to seek out different kinds of work.
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So far, we have looked at several occupations and thought about what would make them attractive to high- or low-testosterone individuals. Trial lawyers, New York taxi drivers, explorers, Masai Mara game poachers, travelers, professional football players, and sex industry operators have interests and abilities different from those of corporate lawyers, accountants, computer programmers, health care professionals, ministers, and managers. Testosterone brings energy, strength, sexual activity, certain spatial and mechanical skills, one-track mental focus, and panache. These traits make better competitors and predators than faithful and supportive partners. They are traits that should be useful to those in rough-and-tumble occupations, occupations that are often associated with low social status. The opposite traits, including steadiness, reliability, empathy, friendliness, sincerity, and deliberativeness, are associated with low testosterone and with success in many high-status jobs in the modern world.
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Now we will describe studies that systematically examine testosterone differences among people in a wide range of occupations. The way that high levels of testosterone affect performance in various jobs is complicated, and when my students and I first started relating testosterone to occupations, we were sometimes surprised. We learned early
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