Introduction: interdisciplinary approaches to sexual development in childhood and adolescence Jen Gilbert and Sharon Lamb; Part I. What is Sexual Development?: Section 1. Children: 1. Are children sexual? Who, what, where, when and how? Sharon Lamb, Lindsay White and Aleksandra Plocha; 2. Towards a central theory of childhood sexuality: a relational approach Allison Moore; 3. A sociological exploration of childhood sexuality: a discursive analysis of parents' and children's perspectives Kerry H. Robinson and Cristyn Davies; 4. Not innocent, but vulnerable: an approach to childhood innocence Lucie Jarkovská and Sharon Lamb; 5. The dynamic expression of sexual-minority and gender-minority experience during childhood and adolescence Lisa M. Diamond; 6. Sexual embodiment in girlhood and beyond: young migrant and refugee women's discourse of silence, secrecy and shame Jane Ussher, Alex Hawkey and Janette Perz; Section 2. Adolescence: 7. The diversity of adolescent male sexuality John DeLamater; 8. Developmental trajectories and milestones of sexual-minority youth Ritch C. Savin-Williams; 9. Bad choices: how neoliberal ideology disguises social injustice in the sexual lives of youth Laina Y. Bay-Cheng; 10. From tightrope to minefield: how the sexual double standard 'lives' in adolescent girls' and young women's lives Deborah L. Tolman and Jennifer F. Chmielewski; 11. Gender, class, and campus sexual cultures: white first-generation college students and the transition to college Amy C. Wilkins and Aubrey Limburg; 12. Yellow fever and yellow impotence: the polarity of Asian American sexuality Rosalind Chou and Brittany Taylor; 13. Conceptualizing sexuality in research about trans youth Julia Sinclair-Palm; Part II. How Do We Study Sexual Development?: 14. Critical methods for studying adolescent sexuality Sarah I. McClelland; 15. Loving possibilities in studies of sexuality education and youth Jessica Fields and Lorena Garcia; 16. Difficulties in the study, research, and pedagogy of sexuality Deborah P. Britzman; 17. Numbers and stories: bridging methods to advance social change Stephen T. Russell; 18. Doing it: participatory visual methodologies and youth sexuality research Katie MacEntee and Sarah Flicker; 19. Research under surveillance: sexuality and gender-based research with children in South Africa Deevia Bhana; Part III. Media, Family, Education: What Roles Might Adults Play?: Section 1. Media: 20. Entertainment media's role in the sexual socialization of Western youth: a review of research from 2000-17 L. Monique Ward, Jessica Moorman and Petal Grower; 21. Adventure, intimacy, identity and knowledge: exploring how social media are shaping and transforming youth sexuality Marijke Naezer and Jessica Ringrose; 22. A sociological/psychological model for understanding pornography and adolescent sexual behavior Jennifer A. Johnson and Ana J. Bridges; 23. Young people, pornography and gendered sexual practices Maddy Coy and Miranda A. H. Horvath; Section 2. Family: 24. Puberty as bio-psycho-social enfolding: mothers' accounts of their early-developing daughters Celia Roberts; 25. Stolen childhood: understanding sexualisation of young girls through 'child marriage' in Zimbabwe Sandra Bhatasara, Manase K. Chiweshe and Nelson Muparamoto; Section 3. Education: 26. The fertile, thorny and enduring role of desire and pleasure in sexuality education Sarah Garland-Levett and Louisa Allen; 27. Norm-critical sex education in Sweden: tensions within a progressive approach Anna Bredström, Eva Bolander and Jenny Bengtsson; 28. Robot babies, young people and pregnancy prevention: alternative imaginings of sexual futures Mary Lou Rasmussen and Aoife Neary.