The second edition of this acclaimed guide to understanding sexuality and working with clients on sexuality issues is extensively updated to reflect recent scientific, practice, and social developments in the field. It provides updated information on relevant disorders in the DSM-5, new theoretical approaches, new pharmacological treatments, updated information on STDs, new understandings of transgender individuals, the impact of same-sex marriage laws, controversies over sex addiction, and much more. Chapters are enhanced with the addition of new take-away points, additional worksheets, and a glossary. Additionally, the book's updated instructor package includes sample syllabus and additional case studies, PowerPoints, quiz questions, suggested assignments, and worksheets and client handouts that can be put to use immediately.