venous leak is an inability to maintain an erection in the presence of sufficient arterial blood flow through the cavernosal arteries of the penis . the defect lies in the excessive drainage of veins in the cavernosal tissue of the penis , which underwines normal erection function . this provides extra ordinary venous drainage from the corpora cavernosa of the penis despite the existence of a rigid erection and fails to inadequately keep blood inside the corporeal chambers to maintain an erection of adequate strength . it is still disputed as to what cause the excessive leakiness that is the characteristic of the condition , however it is mostly through that the defect is in the connective tissue of the "tunica albuginea " surrounding the penile veins. penile veins play a pinotal role in achieves a rigid erection . furthur more covernosogram demonstriate that excessively leaky veins can cause drainage of corpora cavernosa . histological specimens of cavernosal tissue in patient with confirmed veno- occlusive disorder show changes in the structure of collagen and elashin making up theconnective tissue of the penis . in addition other possible causes include psychological stress ,testosterone deficiency, nerutoic deficit , testerogen and chronic sytemic diseases such as diabetes .