[Oxytocin and male sexual function].

Oxytocin (OT) is a female hormone with the main function of facilitating uterine contraction and milk ejection. Recent studies show that OT is involved in multiple signaling pathways in the central and peripheral nerve system and mainly regulates the physiology and activity of reproduction, including male reproduction and sexual behavior. The roles of OT in penile erection are bio-phasic with proerectile effect in the central nerve system while peripherally inhibiting erection.