Erectile DysfunctionOligospermiaPenile ErectionImpotence, VasculogenicPenisAzoospermiaSulfonesInfertility, MalePhosphodiesterase 5 InhibitorsMesterolonePenile ProsthesisPurinesSperm CountPhosphodiesterase InhibitorsCarbolinesPenile ImplantationHydrocarbons, BrominatedChromosomes, Human, YPiperazinesSperm MotilitySpermatogenesisPriapismTestisTestosteroneAlprostadilSexual Dysfunctions, PsychologicalSexual Dysfunction, PhysiologicalPenile IndurationLibidoUrological AgentsCyclic Nucleotide Phosphodiesterases, Type 5TriazinesSpermatozoaPapaverineErgoloid MesylatesVasodilator AgentsCoitusSex CounselingUrologic Diseases3',5'-Cyclic-GMP PhosphodiesterasesEjaculationButeaVentricular Dysfunction, LeftHypogonadismTreatment OutcomeInjectionsKiller Cells, NaturalVacuumUrethraPrevalenceRisk FactorsSet (Psychology)Premature EjaculationTribulusPatient SatisfactionQatarEpimediumProstatectomyQuestionnairesPenile DiseasesOrgasmUrination DisordersApomorphineCarthamusCynomoriumSeverity of Illness IndexPhentolamineDouble-Blind MethodEndothelium, VascularImidazolesTime FactorsMen's HealthLepidiumNitric Oxide Synthase Type IUrinary IncontinenceProstatismNitric OxideDisease Models, AnimalDiabetes ComplicationsCardiovascular DiseasesAgingAdrenergic alpha-AntagonistsPanaxPhytotherapyMuscle, SmoothEunuchismProspective Studies