Eligible subjects must have 2 consecutive assessments of morning T below 300 ng/dL and LH below 9.4 mIU/mL. They will provide 2 sperm samples at baseline, at least 2 days apart, another 2 after 12 weeks of treatment, and up-titrated subjects will provide an additional 2 samples at the end of treatment. After 12 weeks of treatment (V5) all subjects will undergo serial T assessment for determination of the Cavg. Safety assessments will include collection of adverse events, eye examinations, physical examinations and clinical laboratory assessments.