- The Myth of Monogamy: Fidelity and Infidelity in Animals and People
- Payback: Why We Retaliate, Redirect Aggression, and Take Revenge
- Making Sense of Sex: How Genes And Gender Influence Our Relationships
- Strength Through Peace: How Demilitarization Led to Peace and Happiness in Costa Rica, and What the Rest of the World can Learn From a Tiny, Tropical Nation
- How Women Got Their Curves and Other Just-So Stories: Evolutionary Enigmas








