From CNN:
Erectile dysfunction is something that regularly should be addressed in the medical history of patients; it might be a symptom of early atherosclerosis.
Men with ED who are going to a general practitioner or a urologist need to be referred for a cardiology workup to determine existing cardiovascular disease and proper treatment. ED is an early predictor of cardiovascular disease.
References:
Study: Erectile dysfunction may indicate heart disease, death risk - CNN.com.
ED, Depression, Heart Disease: Does the Existence of One Component of This Triad Necessitate Inquiring the Other Two? http://goo.gl/EKvKl
Image source: Viagra (sildenafil), Wikipedia, GNU Free Documentation License.