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Purpose — The aim of this study was to investigate relationships between hypogonadism and sexual function in males with and without type II diabetes, based on the moderating roles of marital status, level of education, and age. Specifically, the predictive role of hypogonadism in sexual function was investigated. Method — The participants included 229 males with and without type II diabetes. A demographic questionnaire, the International Index of Erectile Function (IIEF), and the Testosterone Level Test (TLT) were used in this study. Results — Patients with type II diabetes had significantly lower testosterone levels, erectile function, orgasmic function, sexual desire, intercourse satisfaction, and overall sexual satisfaction than individuals in the control group. Erectile function, orgasmic function, sexual desire, intercourse satisfaction, and overall sexual satisfaction had significant positive relationships to the total testosterone level in this sample. The total testosterone level accounted for 39 percent of overall sexual function variation in this study. Conclusion — Patients with type II diabetes have higher levels of hypogonadism and lower sexual function than healthy individuals, and there is a significant linear relationship between total testosterone level and sexual function in males.