Impotence means that a man's penis doesn't get hard enough to have sexual intercourse. The man cannot get or maintain an erection. The medical term is erectile dysfunction. This condition affects approximately 30 million men in the United States. Erectile dysfunction is not the same as premature ejaculation, which is ejaculating within 1 minute after initiation of intercourse.
The major causes of erectile dysfunction include:
Vascular (blood vessel) disease - Erections...
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Source: ADAM Encyclopedia
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