"Sex at Dawn" by Christopher Ryan and Cacilda Jetha is an insightful non-fiction book that challenges conventional views on human sexuality. The authors, both experts in their fields, combine insights from various disciplines such as anthropology, psychology, and sociology to explore the roots of human sexual behavior. They argue that monogamy is not the natural state of humans and illuminate the evolutionary origins of sexuality. The book offers a critical analysis of prevailing theories and presents an optimistic perspective on human capacities for love and cooperation. By connecting scientific evidence with provocative theses, "Sex at Dawn" encourages readers to reflect on their own views of relationships and sexuality.