Dr. Oz goes public with your private questions about the penis. Learn what's normal, what's not, and what you don't know about men's sexual health. Here, Dr. Oz and the world's leading sex experts tackle a tough question: Does the penis get smaller with age?

Click here to watch Part 2.

Click here to watch Part 3.

Click here to take Dr. Oz's Sex Quiz. What's your bedroom IQ?

Whether it's falling or flying, Dr. Oz has the answers to why you have the dreams that you do and what they might mean.