Sex at Dawn

Christopher Ryan, PhD, Cacilda Jethá, MD

3.7 (34000) 8 min read 6 key ideas

Two researchers challenge conventional assumptions about monogamy's evolutionary basis, arguing human sexuality evolved in a more flexible, socially cooperative context.

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Key takeaways

Challenging the Standard Evolutionary Narrative
Evidence From Primatology
Prehistoric Social and Sexual Cooperation
Anatomical Evidence and Its Interpretation
Not a Prescription for Non-Monogamy
One Argument Among Competing Views

Final takeaway

The book is best approached not as a definitive account of human evolutionary sexual history, but as a genuinely provocative challenge to examine which of your own assumptions about "natural" relationship structures reflect actual evolutionary evidence versus culturally and historically specific norms that have simply come to feel natural through familiarity.