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. Accurate risk factor identification and characterization are essential in preventing or treating erectile dysfunction. In years past, it was commonly believed to be due to psychological problems and treatment was managed by psychologists and psychiatrists. Now it is known that 80-90 percent of impotence is caused by physical problems, usually related to the blood supply of the penis. Many advances have occurred in both diagnosis and treatment of erectile dysfunction .