To obtain data on the prevalence of erectile dysfunction (ED) and its correlates, along with help-seeking behaviour, 655 randomly selected men at least 25 y old, residing in Casablanca, Morocco, were recruited. They responded to a questionnaire administered by five trained sociologist interviewers. Information on demographics, concomitant diseases, drugs, and sexual activity was collected. ED was prevalent in 54%, increased noticeably with age, and was highly prevalent between both the illiterate and those employed. Risk factors were diabetes, hypertension, heart disease, and smoking. Limited sexual satisfaction, low frequency of intercourse, and a disturbed psychological state with depressed mood had negative effects on erectile function. Given its prevalence in our country, ED should be considered an important medical problem with a multifactorial aetiology, making the cooperation of a multidisciplinary management team highly recommended.