yeah
also another old one about not being able to get off in a girl if you get too used to your own hand
these days - there's interesting research correllating teenage wanking with a (significant) reduction in the risk of developing prostate cancer in your old age. Prostate cancer happens to be one of the major causes of death in males (or is it the most common form of male cancer? I forget the details - it's big anyway).
translation: masturbation is good for you and increases your lifespan.
So good actually, that it should be one of the questions on life-insurance application forms: "How many times per week did you masturbate, on average, during your teenage years?" ... with a reduction in the premium for a high number ...