This volume is the first to aim at summarizing all of the scientific literature published so far regarding male-female differences and similarities, not only in behavior, but also in basic biology, physiology, health, perceptions, emotions, and attitudes. Results from over 18,000 studies have been condensed into more than 1,900 tables, with each table pertaining to a specific possible sex difference. Even research pertaining to how men and women are perceived (stereotyped) as being different is covered. Throughout this book's eleven years in preparation, no exclusions were made in terms of subject areas, cultures, time periods, or even species. The book is accompanied by downloadable resources containing all 18,000+ references cited in the book. Sex Differences is a monumental resource for any researcher, student, or professional who requires an assessment of the weight of evidence that currently exists regarding any sex difference of interest. It is also suitable as a text in graduate courses pertaining to gender or human sexuality.