The Garos Sexual Behavior Index (GSBI) was developed to measure constructs associated with disorders of sexual frequency and control. The scale consists of 70 items representing four clearly defined factors: Discordance, Sexual Obsession, Permissiveness, and Sexual Stimulation. The present study indicates that the measure shows acceptable degrees of discriminate validity, and it correlated as expected with constructs such as impulsivity, sensation seeking, self-esteem, and depression. The authors present results of two discriminant functions (to determine the measure’s differentiating capability) and of MANOVA analysis (to determine whether significant differences existed between various groups responding to items on the Index). Results from each of these studies are reported and discussed.