It is vitally important that psychotherapists bring a strong understanding of the nature of love to their work with the many clients who are struggling, in one way or another, with love relationships. With this in mind, the present paper is designed to accomplish two purposes. The first of these is to provide an adequate answer to an old and perplexing question: "What is romantic love?," and to do so in a way that illuminates why this one relationship possesses the extraordinary importance and centrality in human existence that it so clearly does. The second is to identify and discuss the most common barriers to persons being able to love that are encountered in clinical practice.