Atherosclerosis, a condition in which fatty deposits build up inside arteries, may restrict blood flow to the penis and cause erection difficulties. "The small blood vessels that go to the penis can become diseased much earlier than the [larger] vessels that go to the heart," Karen Boyle, MD, a urologist at Johns Hopkins School of Medicine, tells WebMD. "In younger or younger middle-aged men, ED is often the first sign of atherosclerosis."

Men who wish they had more stamina in the bedroom sometimes reach for male enhancement products. These products come in a liquid form and a tablet form that help men struggling with a healthy sex life. Choosing sexual enhancement tablets is a rough task because there are so many different types of products sold under this name. Walgreens.com offers male enhancement products from well-known brands as ExtenZe and Enzyte.

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