One theory regarding the universality of the incest taboo 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, known as the Alliance Theory, proposes that by prohibiting incestuous relationships, people are encouraged to form alliances with individuals outside their immediate kin group, leading to greater social cohesion and cooperation.

One Theory Regarding the Universality of the Incest Taboo Argues