This book investigates the evolutionary and biological origins of male bonding and its role in the formation of human social structures. Lionel Tiger, a prominent anthropologist, utilizes a framework rooted in ethology and evolutionary biology to argue that male-male social bonds are a distinct, biologically influenced phenomenon. He examines how these bonds have historically facilitated group cooperation, hunting, and political organization, suggesting that such behaviors are not merely cultural constructs but are deeply embedded in the human evolutionary history.

Experts often cite this work as a foundational, albeit controversial, text in the field of evolutionary anthropology. Readers frequently note the academic density of the prose and the provocative nature of the author's claims regarding gender-based social behavior.