As a result of innovative technologies and a globalized world, temptation and opportunity often intersect, allowing infidelity to increasingly create problems between spouses, partners, and other couplings in which at least one person expects exclusive intimacy. In this timely work, the author, a noted couples therapist, examines the challenges of affairs, including types of affairs; their motivations and effects; and how to repair and improve a relationship, or part ways, after an affair. Addresses motivation and reasons for infidelity and whether relationships can be affair-proofed. Includes real-life vignettes to illustrate points, and explains how to respond to discovery; minimize disruption for children; and when separation or divorce is the chosen solution, how to keep post-breakup life stable as well as satisfying. For readers looking for advice on how to react to, cope with, or avoid infidelity, and for psychology, counseling, and social work students and professionals.