The book then moves on to discuss cognitive adaptations for social exchange, citing human and non-human examples. The book also includes the evolutionary psychology of mating and sex, examining preferences for mate selection and competition, mechanisms for sexual attraction, and the evolutionary use of women as chattel (something any Old Testament and Quran reader can relate to).

A significant portion of the book is devoted to parental care and children, examining how pregnancy sickness, patterns between twins, maternal-infant vocalizations, and child play in the form of chasing each other are all evolutionary mechanisms that continue to be featured.

Steven Pinker adds an essay on natural language and natural selection; Roger Shepard contributes an essay on the man's perceptual adaptation to the natural world; both of which demonstrate the interconnectedness between perception, language, and adaptation.

The book concludes with some of its most esoteric issues: environmental aesthetics, intrapsychic processes, and the theoretical implications of culural phenomena.

The whole book, while not necessarily over-academic, is ultimately dense reading. Most of the concepts and conceptualizations require mental work to apprehend, while the statistics and empirical evidence are clearly described. While drawing from many disparate areas of evolutionary biology, all the essays find their ultimate significance in how the mind, in particular, has adapted to environmental forces. A demanding, but facinating, read.