Prevention of erectile dysfunction

http://www.health24.com/medical/Condition_centres/777-792-1446-1683,25452.asp
Prevention
Many erection problems can be prevented or even reversed by a more relaxed approach to sex and by rediscovering sensuality. Sexual intimacy is a form of communication. If you and your partner talk about your lovemaking, it will help reduce your stress and anxiety, so that your sexual activity becomes more relaxed. Many people avoid talking about problems in their sexual relationship. It may gradually become more difficult to get and maintain an erection as you get older. However, foreplay and the right environment can increase your ability to have an erection, regardless of your age.
Bicycle seats can cause impotence
If you’re a cyclist, it’s a good idea to lift out of your seat when you’re going over bumpy terrain. This could help avoid vascular damage that may lead to erectile dysfunction. Researchers found that the typical narrow, pointed bike seat can crush the arteries that fill the penis with blood. When a male sits on a narrow bike seat, too much weight is placed on the area between the anus and the scrotum, where the cavernosal arteries are located. Researcher Pedram Salimpour of the Boston University School of Medicine found that about four percent of cyclists studied suffered impotence, compared to one percent of runners. Salimpour says the problem can be avoided by using special bike seats with oval gaps, similar to a toilet seat.

How High Blood Pressure Causes Erectile Dysfunction

http://highbloodpressure.about.com/od/associatedproblems/a/impotence.htm
Nobody knows exactly how high blood pressure causes erectile dysfunction and impotence. One leading theory is that the excess pressure in the blood vessels actually causes damage to small arteries in the penis.
Normally, these arteries dilate in response to sexual stimulation, allowing more blood to flow into the spongy tissue of the penis to produce an erection. It is thought that excessive pressure on these arteries may cause tiny tears, which the body then repairs. In response to these tears, the healed arteries become thicker, allowing them to better resist further damage. These thicker arteries, though, aren’t able to respond as fast, or as completely, to demands for extra blood, so they become a sort of dam in the flow of blood to the erectile tissues of the penis.
One problem with this theory is that some studies seem to show that how long a patient has had high blood pressure is not as important for predicting the risk of erectile dysfunction as is the actual severity of the high blood pressure. In other words, someone who has had moderate hypertension for twenty years sometimes appears to be at lower risk for erectile dysfunction than a young man who has had very serious hypertension for only a few months. In light of this, other theories of how high blood pressure contributes to erectile dysfunction have been proposed.