Congenital venous leak or veno-occlusive dysfunction is an important cause of vasculogenic erectile dysfunction, posing a significant challenge to urologists. To date no medical therapy exists for the treatment of this condition, whilst surgical management options are based on resection or ligation of the offending venous drainage with a significant decline in efficacy with follow-up exceeding 12 months, perhaps as a consequence of collateral drainage. This review article highlights the importance of veno-occlusive dysfunction. We discuss the pathophysiology, investigations and the required treatment. Level of evidence: Not applicable for this multicentre audit.