Sexual function does not change when serum testosterone levels are pharmacologically varied within the normal male range**This work (Project CSA 90-063) was supported by the Contraceptive Research and Developmental Program (CONRAD), Eastern Virginia Medical School, Norfolk, Virginia, under a Cooperative Agreement (DPE-2044-A-00-6063-00) with the United States Agency for International Development (A.I.D.). The views expressed by the author(s) do not necessarily reflect the views of Agency for International Development. Additional support was provided by National Institutes of Health, Bethesda, Maryland, General Clinical Research Center grant M01-RR-00425.