Introduction, John Bancroft PART I: Interaction of Biological and Environmental Factors in Adolescence and Puberty 1. Factors Controlling the Onset of Puberty in Primates, Judy Cameron 2. The Onset of Human Puberty--Biological and Environmental Factors, Nancy J. Hopwood 3. Biological and Social Influences on the Endocrinology of Puberty: Some Additional Considerations, June M. Reinisch and Stephanie A. Sanders 4. A Comparative Primate Perspective on Adolescence, Leonard A. Rosenblum 5. Hormonal and Social Determinants of Adolescent Sexual Initiation, J. Richard Udry 6. Hormones and Behavior at Puberty, George P. Chrousos and Editha D. Nottleman 7. Changing Patterns of Psychiatric Disorders Over Adolescence, Michael Rutter 8. Mood Changes During Adolescence, Robert T. Rubin PART II: Social and Cultural Aspects of Adolescent Sexuality 9. Emerging and Submerging Adolescent Sexuality: Culture and Sexual Orientation, Mary Hotvedt 10. Social Support/Pressure and Adolescent Sexual Behavior, Jan E. Trost 11. Factors Affecting Adolescents: Have They Changed in 40 Years?, Gail Wyatt 12. The Impact of Socio-Cultural Influences in Adolescent Sexual Development: Further Considerations, John Bancroft 13. Trends in Adolescent Sexual Activity, Contraception and Pregnancy in the United States, Sandra L. Hofferth 14. Cultural Influences on Adolescents' Reproductive Behavior, Jacqueline Dorroch Forrest 15. Legal and Social Dilemmas of Adolescent Sexuality, Hymann Rodman, with Commentary by Harriet Pilpel 16. Adolescence and Puberty: An Overview of the Symposium, Malcolm Potts