The third part speculates about possible cognitive differences between men and women. Part four consists of a single chapter of general sociological commentary on broader community discussion of the relationships between men and women. The addendum that concludes the book is offered in support of the anthropological consensus described in chapter 2 of part I, but has been considered by some to be the most valuable part of the total work,
The third part investigates possible cognitive distinctions between genders. Part four includes a single chapter addressing broader sociological debates about men and women's relationships. The final section of the book, intended to reinforce the anthropological perspective in Chapter 2 of Part I, is considered by some to be the most significant part of the work.