I'm almost 20 years old with this problem arising since i was 18 year old, initially after masturbating my penis used to burn for some time and it would go away after that, from last few days its been bit longer today i did masturbate while taking bath now whenever i pee i feel sharp burning sensation inside my penis, is it due to some soap which might have got inside or what ? Why does my penis hurt after masturbating? How can I stop it? is masturbating harmful ? if yes How harmful or unhealthy is masturbation? one more thing many times if i masturbate more my balls starts hurting now Why do my balls hurt after masturbating a lot? does it have side effects as I have lost weight over period of time ? Can I lose weight by masturbating? shall i contact doctor or what ?