Masturbation is generally considered to be a natural part of growing up. It allows one to explore his or her own sexuality in a safe and private way. Masturbation can help to release tension and lower stress levels. Some psychologists even argue that it is a necessary part of developing a healthy attitude toward sexuality.
There are really no harmful physical effects of masturbation; however in some religious philosophies there are rules against it. I can't really explain the origin of these to you, but I can tell you that these ideas are not based on any scientific or anatomical facts. Obviously if someone does it roughly or too frequently they could cause wear to the tissues involved and feel soreness, but that is the only physical issue.
I thank masturbation makes one not to satisfy the other in incase that person gets into sexual intercouses