In this volume, Romance and Sex in Adolescence and Emerging Adulthood: Risks and Opportunities, top scholars in the field of family research examine the nature and origin of adolescents' contemporary patterns of sexual and romantic relationships, spanning such diverse topics as the evolutionary roots of these behaviors, as well as policies and programs that represent best practices for addressing these issues in schools and communities. The text offers interdisciplinary expertise from scholars of psychology, social work, sociology, demography, economics, human development and family studies, and public policy. Adolescents and young adults today face very different choices about family formation than did their parents' generation, given such societal changes as the rise in cohabitation, the increase in divorce rates, and families having fewer children. These demographic trends are linked in important ways and provide a backdrop against which adolescents and emerging adults form and maintain romantic and sexual relationships.