HypogonadismHormone Replacement TherapyTestosteroneAndrogensKlinefelter SyndromeOrchiectomyEstrogen Replacement TherapyRenal Replacement TherapyTestosterone PropionateLibidoDrug ImplantsCastrationEnzyme Replacement TherapyAdministration, CutaneousLuteinizing HormoneErectile DysfunctionEstradiolTestisReceptors, AndrogenFollicle Stimulating HormoneInjections, IntramuscularProstateBody CompositionAgingTime FactorsTreatment OutcomeRats, Sprague-Dawley