Parkinson's disease and temporal lobe abnormalities are contributing factors too. Men suffering from stroke and alcoholism are at very high risk because of damage to the testicles in chronic alcoholism and the loss of testosterone. Aging is a tremendous factor in erectile dysfunction, often related to a decrease in male hormones. Chronic renal insufficiency is another potential cause. Many drugs used to treat high blood pressure that comes with chronic renal insufficiency can cause erectile dysfunction, and many drugs by themselves cause it.
Recreational drugs are a major cause of erection problems.
The number one drug is tobacco. Experiments show that even two cigarettes will markedly decrease the blood flow to the penis if smoked before sex. Marijuana and alcohol are also big causes of erection problems. Prescription drugs are also a big culprit, especially those used for treatment of high blood pressure. Drugs to lower Cholesterol.