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Vascular problems account for the majority of cases and can be caused by diseases such as high blood pressure, type 2 diabetes, high cholesterol, and cardiovascular disease, according to the American Urological Association.

More men experience impotence as they age, according to the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK).

Orgasm and ejaculation are separate physical processes.

Fear, anxiety, guilt, and low self-esteem can contribute to 80 percent of the problem. Emotional and psychological issues are usually secondary factors that occur after impotence is experienced, the NIDDK says.

Oral testosterone may help, if testosterone levels are found to be low. There are drugs that can be injected into the penis or taken by mouth before intercourse. Vacuum devices, bendable rigid implants, or inflatable pumps can help some men with erectile dysfunction.