The editors and their authors have produced a definitive and scholarly, yet readable, state-of-the-art presentation of a fascinating and timely topic. This landmark volume is rich in ideas, conclusions, and questions for the future. As the editors point out, we are all being exposed, like it or not, to hormones in the environment and to ads full of claims about the benefits of administering hormones. We need to understand how such hormones might (or might not) be affecting social relationships. Will spraying on some oxytocin make your colleagues like you? Probably not, but reading Endocrinology of Social Relationships produced warm feelings about the ability of good science to illuminate the human condition. -- Elizabeth Adkins-Regan Science 20090529 [ This book] is an incredible resource for anyone who has studied or ever wondered about the biological underpinnings of human's (or even non-human's) social interactions...In the past 15 years, there have been many studies published on the topic of hormones' roles in social relationships, but never before has there been one definitive volume that reviews the entire area with such a high degree of accuracy. Given that some developments within this area have been recent, the book represents a formidable effort to collect the modern work into one volume, and as a result, it will serve as a "go-to" text for many years. -- Maryanne Fisher Evolutionary Psychology