SulfonesPurinesPiperazinesPhosphodiesterase InhibitorsPhosphodiesterase 5 Inhibitors3',5'-Cyclic-GMP PhosphodiesterasesErectile DysfunctionHealth Care CostsCyclic Nucleotide Phosphodiesterases, Type 5Costs and Cost AnalysisDrug CostsCost of IllnessHomosexuality, MalePenile ErectionMethamphetamineVasodilator AgentsCyclic GMPGeorgiaCost ControlDirect Service CostsCost SharingCost-Benefit AnalysisUnsafe SexCost AllocationRisk-TakingSexual BehaviorModels, EconomicEmployer Health CostsQuality-Adjusted Life YearsUnited StatesHealth ResourcesHospitalizationManaged Care ProgramsEfficiencyLength of StayInsurance Claim Review