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Evolution is a brutal primal force, and the consequences of natural selection litter the genome. Evolution may also contribute to the battle between the male and female of each species, as exemplified by a reproductive artifact known as sexually antagonistic coevolution. Consider the seed beetles — various species of the genus Callosobruchus. The male seed beetle has developed elaborate, sclerotized penile spines to prevent being displaced from the female by other males during copulation. These spines benefit the male beetle but cause damage to the female, as is evident in linear and annular melanized scars observable in the genitals of the female beetle. A counteradaption, however, helps the female protect herself …