Erectile dysfunction (ED, impotence) varies in severity; some men have a total inability to achieve an erection, others have an inconsistent ability to achieve an erection, and still others can sustain only brief erections. The variations in severity of impotence problems make estimating its frequency difficult. Many men are also reluctant to discuss erectile dysfunction with their doctors and seek impotence advice, and thus the condition is under-diagnosed. Nevertheless, experts have estimated that male impotence and erectile dysfunction affects 30 million men in the Untied States alone.

While erectile dysfunction can occur at any age, it is fairly uncommon among young men and more common in the elderly. By age 45, most men have experienced an impotence problem at least some of the time, though not many will seek impotence advise. According to the Massachusetts Male Aging Study, complete impotence increases from 5% among men 40 years of age to 15% among men 70 years and older. Population studies conducted in the Netherlands found that some degree of erectile dysfunction occurred in 20% of men between ages 50 to 54, and in 50% of men between ages 70 to 78. In 1999, the National Ambulatory Medical Care Survey counted 1,520,000 doctor-office visits for erectile dysfunction.

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