Erectile dysfunction has been defined by the National Institutes of Health as the inability to achieve and/or to maintain an erection for satisfactory sexual intercourse. It may result from psychological or organic causes. With the advent of oral pharmacotherapy, the diagnostic approach has significantly changed over the past decade. The number of patients examined at the radiology clinics has also been decreased. However, evaluation by imaging modalities, such as color Doppler ultrasound, cavernosography, and angiography, still remains the cornerstone of the diagnostic workup of the patients with erectile dysfunction. The aim of this review was to focus briefly on the penile anatomy, the pathophysiology of erection, and radiological techniques for investigating vascular causes of erectile dysfunction and findings on different radiological methods.