In comprehensive detail, David C. Geary describes how men and women differ based on evolutionary principles, how human sex differences are similar to those found in other species and how the expression of these differences is uniquely human. The principles of sexual selection—such as female choice and male-male competition—explain sex differences in parenting, mate choices, ways of competing for mates, social-political preferences, development, the brain, and cognition. Far from being one-sided in the nature-versus-nurture debate, Geary shows how an evolutionary framework can easily incorporate the influence of experience and cultural context on the development and expression of sex differences.

Thoroughly updated and expanded, this third edition adds a chapter on sex differences that emerge in modern contexts, like occupational choices, variation in sexual orientation, gender identity, and relationships. Scholars from a wide range of sciences have much to learn from this monumental volume.

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