This book brings together in one volume Peter Masters' BDSM Relationship series: Understanding BDSM Relationships, BDSM Relationships - How They Work, and BDSM Relationship - Pitfalls and Obstacles. The first book, Understanding BDSM Relationships, looks at the principles and psychology which underlie BDSM itself and, more importantly, which underlie the relationships between people who practice BDSM. He defines tools which can be used to recognise, understand, analyse, and diagnose what's happening and what's not happening in BDSM relationships. The second book, BDSM Relationships - How They Work, builds on the principles and psychology presented in the first book and looks at how these play out in real life to create satisfying and rewarding BDSM relationships. He explores a wide range of motivations and reasons why people get involved in BDSM and why they look for BDSM relationships, and he discusses a very wide range of BDSM activities---common and uncommon---and how they contribute both to the BDSM relationships themselves and to satisfying the wants and needs within those relationships. The third and final book, BDSM Relationship - Pitfalls and Obstacles, looks at what can and does go wrong in new, evolving, and existing BDSM relationships. He describes many problems specific to either BDSM or to BDSM relationships, their causes and, where possible, their cures.