ED is defined as the inability to achieve and/or maintain an erection of the penis sufficient for satisfactory sexual intercourse. It has been found that in addition to the age factor, the following factors are associated with ED: Unhealthy lifestyle habits Living conditions Cardiovascular disease, hypertension, hyperlipidemia Diabetes, endocrine abnormalities, liver and kidney insufficiency Psychological factors Trauma, pelvic surgery Abnormal nerve function Drug side effects Drug addiction