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A mere decade or two ago, most clinicians believed that the cause of male sexual dysfunction was largely psychogenic, and epidemiologic data from the 1940s suggested that fewer than 5 million men had erectile dysfunction. In the intervening period we have learned much about the anatomy and physiology of erection and have come to recognize that in the majority of men with sexual dysfunction there are organic causes. Furthermore, recent studies have shown that this condition currently affects as many as 20 million men. This knowledge has opened a vast new world of diagnostic and therapeutic options for patients, one
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