“Sex At Dawn is the single most important book about human sexuality since Alfred Kinsey unleashed Sexual Behavior in the Human Male on the American public in 1948.”
— Dan Savage
Christopher Ryan and Cacilda Jethá’s New York Times best seller, Sex at Dawn: The Prehistoric Origins of Modern Sexuality, has generated a perfect storm of praise and controversy. Drawing on many disciplines, psychology, anthropology, primatology, evolution, and genetics, Ryan and Jetha have come to the conclusion that prehistoric humans may well have made a lot more love than war. Their suggestion that monogamy might not be as “natural” as we think has profound implications about new ways to create and maintain our relationships.
Christopher Ryan, Ph.D.
Christopher received a BA in English and American literature in 1984 and an MA and Ph.D. in psychology from Saybrook University, in San Francisco, CA twenty years later. He spent the intervening decades traveling around the world, living in unexpected places working at very odd jobs (e.g., gutting salmon in Alaska, teaching English to prostitutes in Bangkok and self-defense to land-reform activists in Mexico, managing commercial real-estate in New York’s Diamond District, helping Spanish physicians publish their research). Somewhere along the way, he decided to pursue doctoral studies in psychology. Drawing upon his multi-cultural experience, Christopher’s research focused on trying to distinguish the human from the cultural. His doctoral dissertation analyzes the prehistoric roots of human sexuality, and was guided by the world-renowned psychologist, Stanley Krippner.
Based in Barcelona since the mid-1990s, Christopher has lectured at the University of Barcelona Medical School and consulted at various local hospitals. He speaks about human sexuality to audiences around the world (in both English and Spanish). His work has appeared in major newspapers and magazines in many languages, scholarly journals, and a text book used in medical schools and teaching hospitals throughout Spain and Latin America (see selected bibliography for further details).
Cacilda Jetha, MD
Cacilda Jethá has an Indian face, a European education, and an African soul. She was born in Mozambique to a family that had immigrated two generations earlier from Goa,
India. As a child, she fled civil war to Portugal, where she received most of her education and medical training before returning to Mozambique in the late 1980s. A young physician determined to help heal her country, Cacilda spent seven years as the only physician serving some 50,000 people in a vast rural district in the north of the country. While there, Cacilda also conducted research (funded by the World Health Organization) on the sexual behavior of rural Mozambicans in order to help design more effective AIDS prevention efforts.
After almost a decade in Mozambique, Cacilda returned to Portugal, where she completed her medical residency training in both psychiatry (at the prestigious Hospital de Julio de Matos in Lisbon) and occupational medicine.
She and Christopher currently reside together in Barcelona, Spain, where she is a practicing psychiatrist at Hospital San Joan de Déu and in private practice. She speaks Portuguese, French, Spanish, Catalán, English, and some rusty Tsonga.