1. According to the National Institutes of Health, roughly how many American men have some degree of erectile dysfunction?

a. 500,000 (0.05 percent of the 101 million men over 18)
b. One million (1 percent)
c. 15 to 30 million (15 to 30 percent)
d. 50 million (50 percent)

2. Most cases of erectile dysfunction are "all in the head" -- that is, they're not caused by a physical problem.

True
False

3. Which of the following does NOT raise the risk of erectile dysfunction?

a. Heavy drinking
b. Smoking
c. High blood pressure
d. Frequent masturbation

4. Prescription medications are a leading cause of erectile dysfunction.

True
False

5. Viagra (sildenafil) is the most effective erection treatment available today.

True
False

6. Several herbal products (some marketed as "herbal Viagra") are effective for treating impotence.

True
False