10 Surprising Facts about the Male Penis

 
Explore the male anatomy with these 10 surprising facts about the penis. From average size to the number of chambers and age of onset of growth, learn about the unique features of this important reproductive organ. Discover how erections work and the factors that can affect them, as well as the surprising role of the penis during sleep. Impress your friends with your newfound knowledge of the male penis.

1. The average erect penis length is about 5.16 inches (13.12 cm).
   
   
2. The size of a flaccid penis varies greatly and has no correlation with the size of an erect penis.
   
   
3. The penis contains three main cylindrical chambers that fill with blood during an erection.
   
   
4. The head of the penis, also known as the glans, is highly sensitive to stimulation.
   
   
5. The shaft of the penis is made of spongy tissue and is covered in skin.
   
   
6. The average age of onset of penile growth is around 11 years old.
   
   
7. The penis is not a muscle and cannot be flexed or controlled like a muscle.
   
   
8. Erections can occur spontaneously and without conscious control, such as during sleep.
   
   
9. Erections can be lost due to various factors, including age, medical conditions, and psychological factors.
   
   
10. The penis can become erect several times in one night during a period of rapid eye movement (REM) sleep.