There are many factors that can lead to ED. “Psychological causes of erectile dysfunction in young men can include performance anxiety, guilt about sex in general, guilt about having sex with a particular partner, feelings of anger or resentment towards a partner, or simply finding a partner undesirable,” said Carole Lieberman, MD, a psychiatrist on the clinical faculty of the UCLA Neuropsychiatric Institute in Los Angeles.
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"This triggers the release of a neurotransmitter called dopamine, and it sends a chemical message from the brain to the penis, causing an increase of blood flow to the penis. The blood vessels leading to the reproductive system then relax and this allows increased circulation in the genital area. When you aren't aroused, the blood vessels in your penis are only partially open. But when your brain sends messages to your penis that you are ready for sex, the vessels open and allow more blood to enter the area. Because of the increased blood flow, blood gets trapped in the penis, which makes the penis expand and causes an erection."
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Erectile dysfunction is the inability to attain or maintain an erection adequate for the sexual satisfaction of both partners. At one time, doctors tended to blame ED on psychological problems or, with older men, on the normal aging process. Today, urologists say physical factors underlie perhaps 90% of cases of persistent erectile dysfunction in men older than 50.