Cognitive-Behavioral Therapy for Sexual Dysfunction honors the professional legacy of Michael E. Metz, Ph.D. and provides a guide for the practice of sex therapy in a re- lational context, based on sound empirical evidence and the authors’ extensive clin- ical experience.At its core is the comprehensive couple biopsychosocial approach that Mike emphasized for assessment, treatment and relapse prevention with sex- ual dysfunctions through his extensive clinical practice, writings, and professional training workshops. Initially, Mike and Norman Epstein designed the structure and content of the book, and Mike wrote first drafts of the chapters, with input from Norm, especially regarding the cognitive-behavioral and couple dynamic aspects. After Mike passed away in 2012, the book project stalled, but eventually Barry McCarthy, Mike’s longtime co-author on widely disseminated self-help books on male and couple approaches to treatment of sexual problems, joined the project to provide his rich knowledge and experience with Mike’s biopsychosocial approach. Norm and Barry emphasized building on Mike’s foundational work and also up- dating the material based on current research in the field. Staying true to Mike’s thinking and clinical methods was a challenge at times, as there were many instances when we dearly wished we could sit down with Mike and talk through issues in the writing, to share his company and friendship again as well as his expertise.