Is Masturbation Harmful?

Dear Agony Bunny,
Hi, I am a normal 13 year old boy that started masturbating quite early. I found myself at 12 watching porn. My mum was disgusted and took away all my Internet related things for around 6 months. Now, I think I have her trust back, but, I find it really hard to resist the temptation of masturbation. Is Masturbation Harmful?Please help because I don't feel that I can keep this willpower up for much longer without a little help! thanks :)
--- Jimmy

Dear Jimmy,
In general, the medical community considers masturbation to be a natural and harmless expression of sexuality for both men and women. It does not cause any physical injury or harm to the body, and can be performed in moderation throughout a person's lifetime as a part of normal sexual behavior. Some cultures and religions oppose the use of masturbation or even label it as sinful. This can lead to guilt or shame about the behavior. Some experts suggest that masturbation can actually improve sexual health and relationships. By exploring your own body through masturbation, you can determine what is erotically pleasing to you and can share this with your partner. Some partners use mutual masturbation to discover techniques for a more satisfying sexual relationship and to add to their mutual intimacy.