A decade after the publication of the first International Handbook on the Demography of Sexuality, there have been fundamental shifts in how we measure sexual and gender identities and the breadth of available population-level sexuality data. The chapters in this second edition of this handbook provide guidance on methodological approaches involved in studying population sexuality, as well as insight into the ways that sexuality shapes key demographic outcomes. Chapters examine how we measure sexual identities and behaviors on surveys, sexuality changes across the life course, international perspectives on sexual behaviors and identities, and the ways that sexual identities shape families, labor market experiences, and health outcomes. Despite these developments, we still know relatively little about key demographic questions related to fertility and migration for sexual minorities, as well as about understudied topics of sexuality that fall outside of risk-focused analyses. In particular, much of our understanding of sexuality has been motivated by controlling the spread of sexually transmitted infections or adolescent pregnancies, rather than understanding motivations for sexual interactions, such as pleasure. Accordingly, although the research set forth in this book provides insight into existing knowledge of sexual behavior and of sexual minority populations, the chapters also point researchers and policymakers toward needed areas of research and data collection.

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Amanda K. Baumle is Professor of Sociology at the University of Houston, TX, USA, and was a Public Policy Fellow at the Williams Institute at UCLA School of Law. She received her J.D. from the University of Texas at Austin, practicing labor and employment law prior to earning her Ph.D. in Sociology from Texas A&M University. Her research and teaching are focused in the areas of sociology of law and demography, with an emphasis on issues involving gender and sexual orientation. She has published articles in journals such as Social Forces, Social Science Research, Journal of Marriage and Family, Population & Development Review, Population Research & Social Policy, and Social Science Quarterly that examine the intersections of law and demographic outcomes for sexual minorities and questions related to the U.S. Census. She is the lead author of Legalizing LGBT Families: How the Law Shapes Parenthood (NYU Press 2015), the author of Sex Discrimination and Law Firm Culture onthe Internet: Lawyers at the 'Information Age Water Cooler' (Palgrave Macmillan 2009), the coauthor of Same-Sex Partners: The Demography of Sexual Orientation (SUNY 2009), the editor of the International Handbook of the Demography of Sexuality (Springer 2013), and the co-editor of the Handbook on Transgender, Nonbinary, and Gender Minority Populations (Springer 2022). In recent research funded by the U.S. Department of Labor and the National Science Foundation, she focused on an examination of charges of employment discrimination based on sexual orientation and gender identity ("SOGI"). Working with M.V. Lee Badgett and Steven Boutcher of the University of Massachusetts, they drew on confidential data from the U.S. Equal Employment Opportunity Commission to produce the first analyses of federal SOGI employment discrimination charges.

Zelma Oyarvide Tuthill is an Assistant Professor of Sociology and Women's, Gender, and Sexuality Studiesat the University of Houston, TX, USA. She received her Ph.D. in Sociology from Rice University. Her current and previous research projects examine health disparities among minoritized populations and emphasize the relationship between racism, sexism, homophobia, and health outcomes. Drawing on an intersectional framework, her research identifies inequalities in mortality, health status, health behaviors and healthcare utilization across the intersections of race and ethnicity, gender identity and sexual orientation. Her mixed methods work highlights the health vulnerability of people who hold multiple marginalized identities and has been published in Social Psychology Quarterly, Sociological Inquiry, Ethnicity and Health, Social Currents and The Journal of Homosexuality. She recently received funding by the National Science Foundation to identify predictors of risk regarding pregnancy related deaths among racial minority women in Texas.