While erectile dysfunction (ED) is often treated as a taboo subject, it is hardly rare. In fact, beginning at age 40, men increasingly experience some form of sexual dysfunction. There are a number of reasons associated with ED, and not all of them are what come to mind when someone first experience symptoms. To develop and sustain a firm erection requires a balance of functions involving numerous systems in the body. It requires healthy responses from the cardiovascular, neurological, hormonal, and psychological systems. A glitch in any of these parts of the whole process will result in problems. It may not be an easy issue to discuss with someone else, but talking to your doctor may not only help your sexual performance and satisfaction, it may just save your life. The same processes that support an erection are also necessary for many other vital functions of the body, so finding the root of the problem, and acquiring treatment that may include medications as well as lifestyle changes can help you live a longer and happier life.