Penile ErectionPenisPriapismErectile DysfunctionImpotence, VasculogenicPhosphodiesterase 5 InhibitorsYawningNepetaPenile NeoplasmsSulfonesApomorphineEjaculationPurinesCopulationPiperazinesNitric Oxide Synthase Type IAlprostadilPenile IndurationPapaverineSulpiridePhosphodiesterase InhibitorsCyclic Nucleotide Phosphodiesterases, Type 5Nitric OxideMuscle, SmoothElectric StimulationNitric Oxide SynthaseDopamine AgonistsOrgasmLibidoScopolamine HydrobromidePindololRats, Sprague-DawleyMitochondrial SwellingPenile ProsthesisTestosteroneMuscle RelaxationNG-Nitroarginine Methyl EsterPressureClitorisUrologic Surgical Procedures, Male