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Impotence is more common than most clinicians realize. Recent reports estimate that more than 20 million American men between the ages of 40 and 70 years have some degree of erectile dysfunction. Wagner and Kaplan believe that antisexual, Victorian codes of social behavior have inhibited the study of human sexuality. The landmark work of Masters and Johnson has, however, introduced new ideas about genital function and a classification of male sexuality into three phases: libido or desire, erection, and ejaculation.
Medically, it is the erection phase that is amenable to pharmacologic treatment by intracavernosal injection. Actually, this form of therapy
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