Sperm kill rival human
Sperm competition is the competitive process between spermatozoa of two or more different males to fertilize the same egg  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. Sperm competition is an evolutionary pressure on males, and has led to the development of adaptations to increase males' chance of reproductive success.
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Sperm competition - Wikipedia
This forces males to evolve to compete through sperm quantity, leading to ever-larger testicles. Scientists find that as testis size increases, infanticide disappears. Once sperm competition has become so intense that no male can be certain of his own paternity, infanticide disappears. Previous research has shown that infanticide by males is widespread in many mammal species, but most commonly occurs in those species where females live in social groups dominated by one or a few males. Outsiders will fight dominant males for access to females. This may be the main cause of infant mortality in some species, such as Chacma baboons.
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Sperm success and immunity
We all know that individuals fight over potential love interests. But you might be surprised to hear that the fierce rivalry continues behind the scenes — in the form of sperm competition. This is when the sperm of two or more males compete inside the reproductive tract of a female, to fertilise the eggs, something that is widespread in the animal kingdom.
Sperm and eggs are ubiquitous and diverse. What drives them to diverge? DOI: The experience of learning about the birds and the bees is almost universally awkward, bringing to mind textbook cartoons of the male and female reproductive tracts viewed with amazement, confusion or embarrassment.
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