lecture32-slides - Imagine anthropologists from space Human...

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1 Human Mating Systems Pat Barclay Nov. 11 th 2009 Imagine anthropologists from space… What would outside observers predict about human mating? The Alien Anthropologist’s Study: Have people approach members of the opposite sex and ask one of three questions: “Would you go on a date with me?” “Would you come back to my apartment?” “Would you go to bed with me?” How many people do you think would say “yes”? 0 10 20 30 40 50 60 70 80 Date Apartment Bed “Would You…” % who said “yes” Male subjects Female subjects Clark & Hatfield (1989) J. Psychology & Human Sexuality , 2 , 39-55 Why Predict These Effects? Some Basics About Human Mating Human females gestate offspring & aren’t available to reproduce as often as are males Result: biased operational sex ratio (OSR): more human males than females are available to reproduce at any given time Laws of Supply & Demand : results in stronger competition for matings in men than women This tends to lead to a few predictable outcomes:
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2 Results of stronger sexual selection on males than females: Male and female stag beetle 2. Delayed maturity in males 1. Sexual dimorphism in body size and/or weaponry From Daly & Wilson (1999) Scientific American Presents , 10 , 9-14. Results of stronger sexual selection on males: 3. Sex differences in mortality and longevity External Causes: take bigger risks (physical & social) to attract mates Internal Causes: short-term physiological versus despite long-term negative effects (e.g. physiological costs of testosterone) Changes in the sex difference in lifespan, USA Women live longer than men The sex difference in longevity has actually increased
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lecture32-slides - Imagine anthropologists from space Human...

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