1. Your penis is made up of three main parts: the root, which is attached to the pelvic bone; the body, or shaft; and the glans, or head.

2. Your penis is able to expand up to three times its size when it becomes erect, allowing it to fill with blood.

3. Your penis is covered in sensitive nerve endings that make it an erogenous zone, meaning it can be pleasurable to the touch.

4. The average penis is 5.6 inches in length when erect, but can range in size from 1.5 to 10 inches.

5. The foreskin, which covers the head of the penis, is filled with nerve endings and is important for sexual pleasure. It can also protect the head from bruising during vigorous sex.