Darwinian sexual selection theory holds that mate selection occurs inter-sexually, and mate competition occurs intra - sexually for opposite-sex partners. We demonstrate that inter -sexual mate competition can also occur among humans at appreciable rates that vary by culture. In Canada, inter-sexual mate competition was both rare and inconsequential. However, data from two disparate non-Western cultures—Samoa and the Istmo Zapotec Oaxaca, Mexico —show that women frequently compete with feminine same-sex attracted males to acquire and maintain masculine male mates i. During these interactions, women and feminine males both attempted to manipulate the man who was the object of sexual competition; feminine males attempted to entice the target man, whereas women engaged in guarding and emotionally punitive behaviours. We do not anticipate that inter-sexual mate competition will be common in most species or across all cultures.
This advantage was more conspicuous the more genes per organism were simulated and the more genes were involved in the phenotype screened for mate selection. The results suggest that the evolutionary advantage of mate selection becomes evident only when the simultaneous adaptation of several genes are simulated. A cautionary lesson from the model is that mating is not likely to be random in nature and that mate selection may direct evolution by accelerating the exposure to natural selection of relevant traits. That is, models assuming random mating may not reflect what is happening in nature as sexual reproduction is probably associated with mate or gamete selection in most living organisms. Unable to display preview.
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