What Is Erectile Dysfunction?

Also known as impotence, erectile dysfunction is defined as the inability to attain and/or maintain an erection suitable for intercourse. Causes of erectile dysfunction include diseases affecting blood flow, such as atherosclerosis (hardening of the arteries); nerve disorders; psychological factors, such as stress, depression, and performance anxiety (nervousness over his ability to sexually perform); and injury to the penis. Chronic illness, certain medications, and a condition called Peyronie's disease (scar tissue in the penis) also can cause erectile dysfunction.

What Is Inhibited Sexual Desire?

Inhibited desire, or loss of libido, refers to a decrease in desire for, or interest in sexual activity. Reduced libido can result from physical or psychological factors. It has been associated with low levels of the hormone testosterone. It also may be caused by psychological problems, such as anxiety and depression; medical illnesses, such as diabetes and high blood pressure; certain medications, including some anti-depressants; and relationship difficulties.

How Are Male Sexual Problems Diagnosed?

The doctor likely will begin with a thorough history of symptoms. He or she may order other tests to rule out any medical problems that may be contributing to the dysfunction. The doctor may refer you to other doctors, including a urologist (a doctor specializing in the urinary tract and male reproductive system), an endocrinologist (a doctor specializing in glandular disorders), a neurologist (a doctor specializing in disorders of the nervous system), sex therapists and other counselors.

What Tests Are Used to Evaluate Sexual Problems?

Several tests can be used to evaluate the causes and extent of sexual problems. They include:

• Blood tests -- These tests are done to evaluate hormone levels.
• Vascular assessment -- This involves an evaluation of the blood flow to the penis. A blockage in a blood vessel supplying blood to the penis may be contributing to erectile dysfunction.
• Sensory testing -- Particularly useful in evaluating the effects of diabetic neuropathy (nerve damage), sensory testing measures the strength of nerve impulses in a particular area of the body.
• Nocturnal penile tumescence and rigidity testing -- This test is used to monitor erections that occur naturally during sleep. This test can help determine if a man's erectile problems are due to physical or psychological causes.