Penile ErectionForeskinPenisErectile DysfunctionPriapismPhimosisCircumcision, MaleImpotence, VasculogenicBalanitisPenile DiseasesSulfonesPenile IndurationOrgasmLibidoPurinesEjaculationAlprostadilPapaverinePhosphodiesterase 5 InhibitorsFibroblastsApomorphineParaphimosisPiperazinesPhosphodiesterase InhibitorsSkinKeratinocytesHypospadiasPenile ProsthesisPenile ImplantationYawningNepetaSexual Dysfunction, PhysiologicalCoitusUrologic Surgical Procedures, MaleAphrodisiacsCells, CulturedUrethraCopulationCarbolinesErgoloid MesylatesInjectionsNitric Oxide Synthase Type IPapillomaviridaeHaemophilus ducreyiOncogene Proteins, ViralPressureMethoxaminePhentolamineCyclic Nucleotide Phosphodiesterases, Type 5HypogonadismDopamine AgonistsSexual Dysfunctions, PsychologicalNitric Oxide