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By referring to his personal experience and to the publications of several colleagues, the author examines the advantages of co-therapy in couples therapy: intervision on the spot, the expansion of listening, task-sharing, easier handling of transferential spillovers, the doubling of intervention styles, an easier approach to rifts and gender differences, faster evocation of parental transference, and the possibility of instructing trainees. He also considers the risks of conflict or infatuation between therapists, as well as the need for certain qualities in co-therapists, such as: a benevolent openness to the other, the ability to share powers, functions, and knowledge, a low tendency to rivalry, and a tolerance of questioning and challenging.