Erectile Dysfunction is defined as the consistent inability to attain and maintain an erection sufficient for sexual intercourse. ED affects an estimated 189 million men worldwide. Experts believe that 80 percent to 90 percent of ED cases are related to a physical or medical condition, such as diabetes, cardiovascular diseases, and prostate cancer treatment, while 10 percent to 20 percent are due to psychological causes. In many cases, however, both psychological and physical factors contribut.