One theory regarding the universality of the incest ban argues that by forcing people to marry outside their immediate kin group, peaceful alliances between people would extend to include a greater number of individuals.

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This theory, often associated with the anthropologist Claude Lévi-Strauss, suggests that the incest taboo facilitates exogamy (marrying outside one's group), which in turn fosters broader social alliances and reduces conflict between different groups.

One Theory Regarding the Universality of the Incest Ban Argues