SEXUAL SELECTION, THE DIVISION-OF-LABOR, AND THE EVOLUTION OF SEX-DIFFERENCES - RESPONSE

Sexual selection traditionally involves male-male competition and fema le choice, but in some species, including humans, sexual selection can also involve female-female competition and male choice. The degree to which one aspect of sexual selection or another is manifest in human populations will be influenced by a host of social and ecological vari ables, including the operational sex ratio. These variables are discus sed in connection with the relative contribution of sexual selection a nd the division of labor to the evolution of human sex differences.