Two decades of literature and discussion on the topic of therapist-client sexual relationships have revealed much about the nature and consequences of these relationships and have produced an explicit prohibition against such relationships in American Psychological Association (APA) Ethical Principle 6a. This article reviews the literature as it relates to the ethically gray area of sex with former clients. The relative lack of an empirical basis for extending the prohibition of Principle 6a to posttermination relationships is noted. This article describes concepts from three theoretical perspectives about psychotherapy that support an extension of the prohibition to sexual relationships with ex-clients.