SulfonesPurinesPiperazinesPhosphodiesterase InhibitorsPhosphodiesterase 5 Inhibitors3',5'-Cyclic-GMP PhosphodiesterasesErectile DysfunctionCyclic Nucleotide Phosphodiesterases, Type 5Penile ErectionHomosexuality, MaleMethamphetamineVasodilator AgentsCyclic GMPGeorgiaMAP Kinase Kinase KinasesUnsafe SexRisk-TakingSexual BehaviorAdaptor Proteins, Signal TransducingTNF Receptor-Associated Factor 6Mitogen-Activated Protein Kinase 14PolyubiquitinIntracellular Signaling Peptides and ProteinsEdar-Associated Death Domain ProteinTemporal ArteriesProsthesis ColoringNF-kappa B