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After entering the society of civilization, the relations of the male and female have evolved from crossbred of mating group to the monogamy.
进入文明社会以后，人类两性关系从群婚杂交演变为一夫一妻制。
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Since bipeds of the featherless variety generally prefer individual to group mating displays, the benefits of kin selection are less pronounced in humans.
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