The average male has 11 erections during the day and anywhere between three and nine during the night. Nighttime erections are called “nocturnal penile tumescence” and usually last between 25 and 35 minutes each.
Erections keep the penis in shape. “It has to be essentially exercised,” says Tobias Kohler, MD, an assistant professor of urology at Southern Illinois University School of Medicine.
In other words: masturbate, masturbate, masturbate.
Without regular erections, penile tissue can lose elasticity and even shrink, making the penis as much as 1-2 centimeters shorter.
So, again: masturbate, masturbate, masturbate.