Preface -- Prologue -- The analysis of sex differences in social behavior : a new theory and a new method. Social roles as determinants of sex differences ; The meta-analytic revolution -- Sex differences in helping behavior. A social-role analysis of sex differences in helping behavior ; Method for meta-analysis ; Results of meta-analysis ; Discussion -- Sex differences in aggressive behavior. A social-role analysis of sex differences in aggressive behavior ; Method for meta-analysis ; Results of meta-analysis ; Discussion -- Sex differences in other social behaviors. Sex differences in influenceability ; Sex differences in nonverbal behavior ; Sex differences in behavior in small groups ; Conclusion -- The interpretation of sex differences in social behavior. The magnitude of sex differences ; Theoretical implications of quantitative reviews of sex differences ; The validity of gender stereotypes and of scientific generalizations about sex differences.