Cacilda Jethá

Cacilda Jethá is a psychiatrist and co-author of *Sex at Dawn: How We Mate, Why We Stray, and What It Means for Modern Relationships*. With a background in medicine and psychiatry, her work focuses on human behavior, mental health, and the ways cultural and social influences shape relationships and sexuality. Born in Mozambique and of Indian descent, she has lived and worked in multiple countries, bringing a diverse, cross-cultural perspective to her research and writing. 

Her clinical work has centered on treating patients with a wide range of psychological and emotional challenges, which has given her deep insight into human intimacy and relational dynamics. Partnering with Christopher Ryan, she co-wrote *Sex at Dawn*, a provocative book that challenges conventional beliefs about monogamy and human sexuality. Drawing on anthropology, evolutionary biology, and psychology, the book argues that early human societies were more egalitarian in their sexual relationships than modern norms suggest. 

Jethá’s contributions to the book emphasize a scientific and psychological perspective, blending empirical research with an understanding of human emotions and mental health. Her work encourages a reevaluation of traditional ideas about love, commitment, and fidelity, offering a fresh perspective on human mating behavior rooted in evolutionary history.