When one partner in a relationship is unfaithful to the other, it takes a lot of work by both parties involved to salvage the relationship. In today's therapy-friendly climate, marriage/couples counseling is often a part of that rebuilding process. Many couples seek out professional therapy after an affair is out in the open, but often the act of infidelity is revealed while uncovering and discussing unrelated issues for which the couple is in counseling. And yet, amazingly, as common as this complex and difficult topic arises in therapy, there is relatively little professional literature devoted to understanding and "treating" infidelity. In this volume, Paul Peluso has assembled a truly impressive list of contributors from a range of disciplines and backgrounds, including marital therapy, family therapy, evolutionary psychology, marriage research, and cyberstudies, with the aim of filling this void.