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Civilization, in its various guises, had it pretty much worked out.
Society—family, tribe, caste, church, village, probate court—established and enforced its connubial protocols for the presumed good of everyone, except maybe for the couples themselves.
Men were asked to rank drawings of women’s hair styles: a back-combed updo, a Patty Duke bob.
A city also has abundance and access, especially for the young, but as people pair off, and as they corral themselves, through profession, geography, and taste, into cliques and castes, the range of available mates shrinks.