A natural family." Perhaps this easy acceptance between adults and unrelated children, the diffuse nurturing found in societies where children refer to all men as father and all women as mother, societies small and isolated enough to safely assume the kindness of strangers, where overlapping sexual relationships leave genetic paternity unknowable and of little consequence…perhaps this is the "natural" family structure of our species.
( Christopher Ryan )
[ Sex at Dawn: How We Mate, Why ]
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