Surveys suggest that 96% of men and 76% of women have masturbated throughout their lives. There are rumors that masturbation is bad, myths that revolve around ignorance by religions and other beliefs that different cultures possess, touching the body is not a bad thing is even something exciting and relaxing that helps you explore and meet , masturbation secretes dopamine which stimulates the brain in a positive way making you feel pleasure and relaxation, thus reducing stress levels and physical pain, for women masturbation helps lessen the pain caused by the menstrual cycle, masturbation helps reconcile sleep more easily. If you feel you are attacking a bout of flu, good virus is proven to masturbate stimulates the immune system by increasing white blood cells helping you not sick, in men helps reduce prostate cancer, so everything indicates that masturbation is something very good and extremely fun. But why not?, masturbated we humans practice masturbation since we were cavemen this practice has become part of evolution for a long time, maybe we could think that it is an unnecessary waste of energy, but scientifically speaking masturbation aid to improve the ability of sperm, the more you release fewer sperm masturbate, having less active sperm your body produces new energy and more likely to impregnate a woman. So in a nutshell male masturbation can be a method to improve the quality of sperm, as women helps improve sexual performance because over the years the vaginal muscles tend to be interested less elastic and lose strength masturbation helps keep them firm and more control over them, nitric oxide levels decrease with age and this causes less sexual arousal, fortunately masturbate continuously helps your body to continue producing nitric oxide increasing your libido and thus your life sexual. It is clear that wanking is full of positive things however this does not mean you should do it every day, seven times, it is not recommended because it would lose a lot of time and your body gets used to masturbation and when it's time to take the act the reality is a bit tricky to reach the climax, so summarizing simply wanking is a healthy and full practice of health benefits for men and women, masturbating access is not good for health, always remember to keep a balance and change masturbation technique to keep your body in constant uncertainty avoiding custom to a single stimulus. 
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Libido is tied to achievement. Lots of achievement creates lots of sex or masturbation. ;)
...relieves stress