Why are there two sexes? / Turk Rhen and David Crews -- Sex differences in the brain: what's old and what's new / Margaret M. McCarthy and Arthur P. Arnold -- Research and methodological issues in the study of sex differences and hormone-behavior relations / Lisa Eckel ... [et al.] -- Methodological issues in the study of hormone-behavior relations in humans: understanding and monitoring the menstrual cycle / Elizabeth Hampson and Elizabeth A. Young -- Sex differences in pharmacogenomics as a tool to study CNS disorders / Julia Pinsonneault and Wolfgang Sadée -- Sex differences in HPA axis regulation / Elizabeth A. Young ... [et al.] -- Steroid hormone receptors and sex differences in behavior / Toni R. Pak and Robert J. Handa -- Sex differences affiliative behavior and social bonding / Larry J. Young and C. Sue Carter -- Sex differences in the organization of movement / Evelyn F. Field and Ian Q. Whishaw -- Sex differences in motivation / Jill B. Becker and Jane R. Taylor -- Sex differences in neuroplasticity / Csaba Leranth, Neil J. MacLusky, and Tibor Hajszan -- Sex differences in cognitive in cognitive function in rodents / Victoria Luine and Gary Dohanich -- Sex differences in energy metabolism, obesity, and eating behavior / Nori Geary and Jennifer Lovejoy --

Sex differences in children's play / Sheri A. Berenbaum ... [et al.] -- Sex differences in the neurocognition of language / Michael T. Ullman, Robbin A. Miranda, and Michelle L. Travers -- Endocrine contributions to sex differences in visuospatial perception and cognition / Elizabeth Hampson -- Sex differences in infectious and autoimmune diseases / Sabra L. Klein -- Sex differences in neuroimmunology / Steven S. Zalcman -- Sex differences in pain / Emeran A. Mayer, Jennifer S. Labus, and Karen S. Berkley -- Sex differences in anxiety disorders / Margaret Altemus and Laura Epstein -- Hormones and mood / Meir Steiner and Elizabeth A. Young -- Sex differences in brain aging and Alzheimer's disorders / Susan Resnick and Ira Driscoll -- Sex differences in Parkinson's disease / David G. Standaert and Ippolita Cantuti-Castelvetri.