This book showcases a wealth of knowledge and insight on gender and sexuality development. With contributions from leading researchers, it covers a comprehensive set of topics at the forefront of the field and strikes a balance between traditional and emerging areas of study. Given that gender and sexuality are shaped by myriad influences, this book is modelled on an interdisciplinary perspective and delves into biological, comparative, psychological, cognitive, social, cultural, and clinical approaches. In so doing, this collection conveys the rich tapestry of gender and sexuality science and will hold value for many. For those already in the field, this book provides an excellent resource for brushing up on the latest and for inspiring the next phases of scientific investigation. Those who are newer to the field, including undergraduate and graduate students, stand to gain tremendously from not only the thoughtful and informative content, but also from the interdisciplinary approach modelled throughout the book. Beyond academia, this book is a valuable resource for clinicians and policy makers who deal with child and adolescent issues.