Five surprising facts about the penis


For those of you who have one, how well do you know your penis?  I mean, know all the fun facts and strange but true nuances of this unique part of a man’s body?  These are the sort of facts that might reassure you or ones you can impress friends with the knowledge you have about what lies below the belt.

Either way, it is always interesting to learn about this awe-inspiring marvel of the human anatomy capable of bringing pleasure while also contributing to human existence.

      1. Small penises turn into big erections

Non-erect penises come in two sizes – big and small.  Big penises look large even without an erection.  But when one occurs, they don’t get much larger.  On the other hand, a non-erect small penis will grow substantially much larger when erect.  A study published in the Journal of Sexual Medicine took penis measurements of 1,661 men.  Men with a large penis, even when flaccid, only increased by 47% more when erect.  However, men with a small flaccid penis grew a whopping 86% more when standing at attention.  

      2. Your penis is up and down all night long

A healthy penis is quite active during the night.  The average healthy man will have three to five erections a night, with each erection lasting 25-35 minutes.  It is not unusual for a man to wake up with a strong erection which is often his morning wakeup call.  It is not known the cause for all this night action, but it may be associated with the phase of sleep known as REM (rapid eye movement) sleep.  Whatever the reason, doctors see nighttime erections as a good sign of normal functioning.

      3. Love muscle….or not?

Often referred to as the “love muscle,” this is untrue.  The truth is there are no muscles in a penis.  Otherwise, you would be able to bend and move the penis when it is erect. Sexual arousal causes blood to flow to the penis which builds up inside two cylinder-shaped chambers resulting in swelling and stiffening of the penis. The swelling blocks veins to prevent blood from flowing away from the penis. Once a man ejaculates, or the erection deflates, and the swelling goes down, blood can drain away from the penis.

      4. The penis can be broken

No man even wants to think about this, but if a penis is violently twisted or sat upon when erect, it can break. Even though rare, how would a penis fracture happen?  The most likely scenario is during sex when a partner is on top, and the penis slips out of his partner and then is violently bent when the partner comes back down.  

The penis has no bones, but the veins filling with blood when an erection occurs can be burst. This causes blood to pour out of the veins into the penis, causing painful swelling.  

      5. Shoe size does not reflect penis size

A saying says that to know a man’s penis size look at his feet.  Not true.  Researchers of a study published in the British Journal of Urology International measured 104 men’s penises finding no correlation between shoe size and penis length.  The average penis length of this particular group was 5.1 inches, while their average shoe size was a size nine.  


Dr. David Samadi is the Director of Men’s Health and Urologic Oncology at St. Francis Hospital in Long Island. He’s a renowned and highly successful board certified Urologic Oncologist Expert and Robotic Surgeon in New York City, regarded as one of the leading prostate surgeons in the U.S., with a vast expertise in prostate cancer treatment and Robotic-Assisted Laparoscopic Prostatectomy.  Dr. Samadi is a medical contributor to NewsMax TV and is also the author of The Ultimate MANual, Dr. Samadi’s Guide to Men’s Health and Wellness, available online both on Amazon and Barnes & Noble. Visit Dr. Samadi’s websites at robotic oncology and prostate cancer 911. 

Five surprising facts about the penis
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Dr. David B. Samadi

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Dr. David B. Samadi