Although speculative, reciprocal altruism, or strong male-male and female-female alliances that are beneficial for group survival because of emotional binding was suggested by

Question

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Kirkpatrick suggested the idea of reciprocal altruism and strong same-sex alliances for group survival in his book "The Evolution of Human Homosexual Behavior." The other options (Kinsey, Rahman, and Mead) did not specifically propose this concept.

Although Speculative, Reciprocal Altruism, or Strong Male-Male and Female-Female Alliances