What are some of the physical causes of sexual function difficulties and dissatisfaction in men?

Diabetes and alcoholism are leading causes of male erectile difficulties. Other causes of sexual function difficulties include lumbar disc disease and multiple sclerosis, which interfere with the nerve impulses regulating erection. Spinal cord injuries and prostate cancer treatment may affect erectile abilities as well. Alcoholism and drug use are widely associated with sexual difficulties. Smoking may also contribute to erection difficulties. Bicycle-induced sexual difficulties can occur as a result of a flattening of the main penile artery, thereby temporarily blocking the blood flow required for erections. Diseases of the heart and circulatory system may be associated with erectile difficulty.