This text takes an interdisciplinary look at the phenomena of human bonding. The authors draw upon behavioural genetics, molecular genetics of behaviour, cognitive and affective neuroscience, evolutionary psychology, human ethology, behavioural ecology, and the study of attachment processes within developmental psychology. The topics focus on human reproduction, and fertility-related behaviour in particular, and the evolutionary origins and neural underpinnings of such behaviour. This book is for anyone interested in the evolutionary origins, neural underpinnings, and psychological structure involved in human relationships.