https://en.wikipedia.org/wiki/Sperm_competition
Sperm competition is the competitive process between spermatozoa of two or more different males to fertilize the same egg[1] during sexual reproduction. Competition can occur when females have multiple potential mating partners. Greater choice and variety of mates increases a female's chance to produce more viable offspring.[2] However, multiple mates for a female means an individual male has decreased chances of producing offspring. Sperm competition is an evolutionary pressure on males, and has led to the development of adaptations to increase males' chance of reproductive success.[3] Sperm competition results in a sexual conflict of interest between males and females.
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