"...His studies revealed that approximately 95% of males and 60% of females had masturbated.
The National Health and Social Life Survey and other research conducted confirm between 48-95% of people masturbate.
Regardless of cultural attitudes and values, masturbation has been found in all societies.
There are no harmful side effects of masturbation. Medical science has debunked many myths formally associated with masturbation, such as hair growing on the palms, insanity, or that masturbation will drain excessive energy from the body.
The American medical community pronounced masturbation as normal in the 1972 publication Human Sexuality."
http://www.mckinley.uiuc.edu/Handouts/mast
urbation.html
"Masturbation. Most people do it â yet so many people worry about doing it! That's because there are a lot of myths out there that masturbation is dirty, dangerous, or something to be embarrassed about doing. But the truth is, masturbation is safe and healthy, and it's here to stay. People of all ages do it. Guys do it, and girls do it too. Single people and people in relationships do it. Some people do it a few times a day, and some do it a few times a year...."
http://www.teenwire.com/infocus/2004/if-20
041109p332-masturbation.php