Photo: Female Flies Put Up a Fight to Keep Sex Short



Female Drosophila montana fruit flies (pictured, another species of fruit fly) prefer to keep sex short and sweet, while males like it to last longer, scientists said in August 2009.

That's because females see a reproductive benefit from shorter sex: When mating lasts longer, female flies have less time to mate again with a different male, if they do so at all.

Photograph by Oxford Scientific, PhotoLibrary


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