Erectile Dysfunction (ED) is a common and distressing condition affecting an increasing number of men. It is estimated that almost 30 million men in the United States and between two to three million men in the UK suffer from Impotence. According to the American Urological Association clinical guidelines, ED is defined as “the inability to achieve or maintain an erection sufficient for satisfactory sexual intercourse.” The growing incidence of erectile dysfunction is related primarily to a growing aging population worldwide, a rise in prevalence of risk factors (e.g. Diabetes and cardiovascular disease) and in increase in the treatment for prostate cancer. Prostate cancer is now the most commonly diagnosed cancer among Western men and Impotence is a common side effect of treatment. Despite the numbers of men affected by erectile dysfunction is estimated that 90% of ED sufferers are still reluctant to visit their GP because of embarrassment.