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Sex at Dawn is written by Christopher Ryan and published by Harper Collins. It's available with International Standard Book Number or ISBN identification 0061707813 (ISBN 10) and 9780061707810 (ISBN 13).
In this controversial, thought-provoking, and brilliant book, renegade thinkers Christopher Ryan and Cacilda JethÁ debunk almost everything we “know” about sex, weaving together convergent, frequently overlooked evidence from anthropology, archaeology, primatology, anatomy, and psychosexuality to show how far from human nature monogamy really is. In Sex at Dawn, the authors expose the ancient roots of human sexuality while pointing toward a more optimistic future illuminated by our innate capacities for love, cooperation, and generosity.