Masturbation is an enjoyable and perfectly harmless activity. Both men as well as women masturbate. It does not matter how often you do it as long as it does not interfere with the other things you have to do or does not involve anyone else without their consent. Masturbation will not affect your sex life negatively. It is a legitimate sexual activity in its own right and does not cause weakness, stunted growth, pimples, or any psychological problem.