The psychoanalytic tradition has always had difficulty with the question of the therapist's sexual feelings toward the patient. This paper traces that difficulty: from Freud's original struggle to replace moralism with a psychoanalytic mode of understanding, to the more recent literature on countertransference which still seems particularly averse to the possibility of the therapist's sexual experience. By way of a discussion of a psychoanalytic psychotherapy, I argue for the sometimes central therapeutic role of the therapist's experiencing, and then containing, excitement.