Will sperm from multiple men fight.

Will sperm from multiple men fight. If not, they'll "drown" in a thick flow of cervical mucus.

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This dramatic finding has been widely cited yet largely ignored, and there has never been a follow-up study.

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In the context of sexual reproduction, natural selection is generally thought of as a pre-copulation mechanism.

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All contributing lifestyle and collection variables were controlled for in subsequent analyses.

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In a mating- guarding system, both parties, male and female, are able to directly and indirectly benefit from this.

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The general set-up is that copulation with a male causes sperm to be held in all three receptacles.

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