Book excerpt: The Ontogeny of Human Bonding Systems takes an interdisciplinary look at the phenomena of human bonding. The authors draw upon behavioral genetics, molecular genetics of behavior, cognitive and affective neuroscience, evolutionary psychology, human ethology, behavioral ecology, and the study of attachment processes within developmental psychology. The topics will emphasize human reproduction, and fertility-related behavior in particular, and the evolutionary origins and neural underpinnings of such behavior. This book is for anyone interested in the evolutionary origins, neural underpinnings, and psychological structure involved in human relationships.