Until treatment became widely available in the 1990s, erectile dysfunction (ED) was called impotence and few men faced up to the problem. That’s changed. We now know that ED is a medical problem, not a personal failure. We also know that men should discuss ED with their doctors, not hide it because of embarrassment. Above all, we know that ED is treatable. Every man experiences erectile failure from time to time. Doctors diagnose ED when a man is unable to maintain an erection satisfactory for intercourse on at least 25% of attempts.