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Many boys at this age are thin and lean. Masturbation is very harmless and obviously not the cause for the weakness in you. Making modifications in your diet with added proteins in your meals, daily exercise can help you greatly. The best way to gain weight is to get involved in outdoor games which will get you tired and make you hungry to eat and sleep appropriately.
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Masturbation is a natural habit in both the genders during their life time. Continuous masturbation in men will certainly leads to unwanted curvature of penis and in women clitoris looses its sensitivity due to rough use of their fingers on clitoris. Later they may not get normal pleasure or orgasm in intercourse (thrust of penis) after their marriage. Masturbation once a week is fine but do not make it your habit.
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