Biology has an easy explanation for Don Juan's motives -having many lovers lets him produce the greatest number of offspring. But scientists have long wondered why the females of many species seek out multiple mates, because each coupling can cost them precious time and energy without necessarily increasing the number of offspring they can bear. New research shows how, at least in flies, such female promiscuity can reduce the chances that the offspring will inherit bad genes. (source: sciencenow.sciencemag.org)
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