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    Much of the variation we see in the size, shape and number of sperm produced by different species is thought to be the product of competition for fertilisation among the sperm of different males.

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    As mentioned, recent research found that among mammals, males of smaller bodied species tend to invest in fewer, larger sperm, while males of larger species tend to invest in more, smaller sperm.Sperm can also vary depending on the size and shape of the female body.To accommodate this, sperm have to be able to swim far and fast enough, to successfully reach the eggs.In humans, men looking at explicit images of two males and one female (“sperm competition images”) have been shown to produce more mobile sperm than those looking at explicit images of three females.Female animals who mate with more than one partner are also thought to have some control over the sperm that fertilises their eggs.

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