Impotence, or erectile dysfunction, is defined as failing to achieve or maintain an erection more than 20 percent of the time, and, a ccording to the National Institutes of Health, is a symptom in many disorders and diseases. Erectile dysfunction affects millions of men. Although for some men erectile function may not be the best or most important measure of sexual satisfaction, for many, erectile dysfunction creates mental stress that affects interactions with family and associates. It is estimated that two men in five have problems getting an erection at age 40, and nearly seven in ten at age 70.
Premature ejaculation is divided into primary and secondary forms.
Like any learned behaviors, it can be unlearned. Secondary PE is often due to physical causes, usually involving the penile arteries, veins, or both. Erections may be difficult or impossible. Some antidepressant medications cause erectile failure. Organic impotence involves the penile arteries, veins or both.