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 OutcomeInjectionsVacuumKiller Cells, NaturalUrethraPrevalenceSet (Psychology)Risk FactorsPremature EjaculationTribulusQatarEpimediumProstatectomyPenile DiseasesOrgasmPatient SatisfactionApomorphineUrination DisordersQuestionnairesCarthamusCynomoriumPhentolamineSeverity of Illness IndexDouble-Blind MethodEndothelium, VascularImidazolesMen's HealthLepidiumNitric Oxide Synthase Type IProstatismUrinary IncontinenceTime FactorsNitric OxideDiabetes ComplicationsDisease Models, AnimalCardiovascular DiseasesAdrenergic alpha-AntagonistsPanaxMuscle, SmoothPhytotherapyAgingEunuchism