Zoologist Desmond Morris travels the world asking why men and women behave so differently, and how much of that difference is biology versus culture. The series moves from a maternity ward in England, where newborns are already being treated differently based on sex, to villages in Africa and the Americas where gender roles diverge sharply from Western norms. Morris interviews anthropologists, psychologists, and the people themselves, using courtship rituals, child-rearing practices, and workplace dynamics as evidence for his arguments. He draws on his background studying animal behavior, comparing human pair-bonding and aggression to patterns seen in other primates. Topics range from why men dominate positions of power in most societies to whether jealousy and attraction follow universal rules or local customs. The tone stays observational rather than polemical, presenting competing explanations from nature and nurture camps without settling firmly on either. Archival footage and on-location filming across multiple continents give the series a genuinely global scope rather than a Western-centric one.