This chapter explores how sex differences could be responsible for a deep-seated bias in the development of an individual's behavior. It explains the structure of behavior, and can therefore discern a structure common to both humans and subhuman primates. The chapter considers the features typical of these two modalities as shown by chimpanzees, and macaques and baboons. Two modalities are agonistic and hedonic. Features of human societies arise from the fact that these two basic modalities are combined in different ways with the centric tendencies. The chapter considers how the Hedonic Cohesion of the whole group is achieved in a hedonic society through display. The mechanism that holds agonistic societies together is of a different kind. D. R. Omark and M. S. Edelman have recently studied the mental capabilities of children in relation to the social attention structure of the class. Attention, free to be guided by and flow out over objects, even crucial, part of the intelligent use of tools.