Disproportionate attention has long been paid to males in human and other social systems. The basic structures used to explain social behavior in sociological and biological work have overwhelmingly emphasized the significance and shape of male behavior and far less female behavior which is surely at least as important. Stratification, sexual selection, and natural selection of what women do among themselves and how they relate to men was explored in this volume for the first time. It is now available in a paperback edition, with a new introduction by Lionel Tiger.