Contents: Preface. Part I: Framing Sex Differences and Similarities. K. Dindia, Men Are From North Dakota, Women Are From South Dakota. E. Aries, Gender Differences in Interaction: A Reexamination. P.H. Wright, Toward an Expanded Orientation to the Comparative Study of Women's and Men's Same-Sex Friendships. J.A. Hall, How Big Are Nonverbal Sex Differences? The Case of Smiling and Nonverbal Sensitivity. G.N. Powell, L.M. Graves, Gender and Leadership: Perceptions and Realities. M. Allen, K.S. Valde, Researching a Gendered World: The Intersection of Methodological and Ethical Concerns. Part II: Approaches to Sex Differences and Similarities. P.A. Anderson, The Evolution of Biological Sex Differences in Communication. B.R. Burleson, A.W. Kunkel, Revisiting the Different Cultures Thesis: An Assessment of Sex Differences and Similarities in Supportive Communication. A.H. Eagly, A.M. Koenig, Social Role Theory of Sex Differences and Similarities: Implication for Prosocial Behavior. M. Crawford, M.R. Kaufman, Sex Differences Versus Social Processes in the Construction of Gender. L. Di Mare, V.R. Waldron, Researching Gendered Communication in Japan and the United States: Current Limitations and Alternative Approaches. Part III: Sex Differences and Similarities in Communicative Behaviors. A. Mulac, The Gender-Linked Language Effect: Do Language Differences Really Make a Difference? L.K. Guerrero, S.M. Jones, R.R. Boburka, Sex Differences in Emotional Communication. J.K. Burgoon, J.P. Blair, D.B. Buller, P. Tilley, Sex Differences in Presenting and Detecting Deceptive Messages. A.E. Lindsey, W.R. Zakahi, Perceptions of Men and Women Departing From Conversational Sex-Role Stereotypes. P.J. Kalbfleisch, A.L. Herold, Sex, Power, and Communication. Part IV: Sex Differences and Similarities in Romantic Relationships. M.R. Trost, J.K. Alberts, How Men and Women Communicate Attraction: An Evolutionary View. P.A. Mongeau, M.C.M. Serewicz, M.L.M. Henningsen, K.L. Davis, Sex Differences in the Transition to a Heterosexual Romantic Relationship. D.J. Canary, J. Wahba, Do Women Work Harder Than Men at Maintaining Relationships? L.M. Sagrestano, C.L. Heavey, A. Christensen, Individual Differences Versus Social Structural Approaches to Explaining Demand-Withdraw and Social Influence Behaviors. J.T. Wood, Gender, Power, and Violence in Heterosexual Relationships. J.S. Hyde, Epilogue.