Wife sperm competed

In the context of sexual reproduction, natural selection is generally thought of as a pre-copulation mechanism. We are drawn to features of the human body that tell us our partner is healthy and will provide us a fighting opportunity to carry on our genetic lineage. But a new article appearing in the February issue of Current Directions in Psychological Science suggests that the human male has evolved mechanisms to pass on his genes during post-copulation as well, a phenomenon dubbed "sperm competition. In their article, Todd Shackelford and Aaron Getz at Florida Atlantic University describe sperm competition as "the inevitable consequence of males competing for fertilizations. For a monogamous species, sperm competition may seem unlikely. But according to the authors, extra pair copulations i.
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Sperm competition - Wikipedia

A change in social status can quickly lead to a change in the quality of the seminal fluid produced by a male Chinook salmon as he responds to increased reproductive competition from higher-status males. Males compete fiercely with other males for access to reproductive partners Darwin, However, females often mate with multiple males, which means that the ejaculates of the males have to compete with each other in a process known as sperm competition Parker, Competition between males can also be modulated by social hierarchy: dominant males can monopolise access to females, reducing the risk of sperm competition, and making subordinate males much more likely to face sperm competition whenever they manage to mate.
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Sperm competition: The need for speed

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.
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We analyse a co-evolutionary sexual conflict game, in which males compete for fertilizations sperm competition and females operate sperm selection against unfavourable ejaculates cryptic female choice. For simplicity, each female mates with two males per reproductive event, and the competing ejaculates are of two types, favourable having high viability or success or unfavourable where progeny are less successful. Over evolutionary time, females can increase their level of sperm selection measured as the proportion of unfavourable sperm eliminated by paying a fecundity cost. Males can regulate sperm allocations depending on whether they will be favoured or disfavoured, but increasing sperm allocation reduces their mating rate.
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