Two instruments were developed and standardized on first-, second-, and third-grade boys and girls. The Toy Preference Test (TPT) measures sex-role preference, and/or Stereotypic Sex-Role Concepts of masculinity (SRCm) and femininity (SRCf), depending upon the instructions used for administration. The Rating Scale for Children (RSC) taps sex-role adoption. Subjects were at least third generatio...

There is growing interest in resolving the curious disconnect between the fields of kin selection and sexual selection. Rankin's (2011, J. Evol. Biol. 24, 71-81) theoretical study of the impact of kin selection on the evolution of sexual conflict in viscous populations has been particularly valuable in stimulating empirical research in this area. An important goal of that study was to understan...