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Why is Sex Fun?: the evolution of human sexualityNevertheless, as we'll now see, women may have had this motivation in our distant past, and sex may have subsequently assumed a different function that now sustains it. How, then, are we to evaluate these two competing theories? Like so many other questions about human evolution, this one can't be settled in the way preferred by chemists and molecular biologists, a test-tube experiment. Yes, we'd have a decisive test if there were some human population whose women we could cause to turn bright red at estrus and to remain frigid at other times, and whose men we could cause to be turned on only by bright red women. We could then see whether the result was more philandering and less paternal care (as predicted by the daddy-at-home theory) or less philandering and more infanticide (as predicted by the many-fathers theory). Alas for science, such a test is presently impossible, and it will remain immoral even if genetic engineering ever makes it possible. But we can still resort to another powerful technique preferred by evolutionary biologists for solving such problems ...» |
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