Wednesday, April 7, 2010 as of 11:14 AM ET

Erectile dysfunction (ED) is sexual dysfunction characterized by the inability to develop or maintain an erection of the penis during sexual performance.
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Occasional erectile trouble can happen to all men, but persistent trouble getting or keeping an erection can point to an underlying health condition, according to medical experts.
Erectile dysfunction (ED) is defined as the inability to maintain an erection firm enough for sex on an ongoing basis. Symptoms can include trouble getting an erection, trouble keeping an erection or reduced sexual desire, according to the Mayo Clinic.While erectile dysfunction was once considered an emotional issue, consistently unsuccessful erections may indicate physical disorders such as heart disease or uncontrolled diabetes, according to experts at the Mayo Clinic. Whether physical or emotional, ED can cause worry and stress, possibly aggravating symptoms.Overview An erection begins in the brain, where nerves sense sexual stimulation. Those signals are sent to the penis, which in response relaxes, allowing blood to flow into the surrounding spongy tissue. As this tissue becomes saturated, the penis grow...Men who took erectile dysfunction drugs such as Viagra were more likely to become infected with sexually transmitted diseases , including AIDS, U.S. researchers repo...
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