PSYC 472 Lecture Notes - Lecture 15: Sexual Fantasy, Testicle, Human Mating Strategies

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Differences in minimum obligatory parental investment (asymmetry) leads to differences between sexes. Females benefit to extent that they can obtain additional investment or genetic quality from male. Males benefit to extent that they can obtain a female"s obligatory investment. For males, sex is not a big deal; for women, each sexual encounter could potentially result in a very large opportunity cost (and overall cost) Studied sexual selection in a fruit fly population. Mark chromosomes to measure rs of specific individuals. Male rs varied much more than female rs. Males also have greater max rs (most successful male has many more offspring than most successful female) Female rs wasn"t limited by ability to attract males. Females that did not have offspring were courted as much as females who did produce offspring. Versus male rs was severely limited by the ability to attract willing females.

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