Dr. Hanif warmly Welcomes you! Thanks for consulting at my virtual clinic. I have carefully worked through your case, and I can realize your health worries. Being your physician, I assure you not to worry as I will take care all of your medical concerns.   Masturbation and/or nightfall has no link with body weight at large. Weight gain and weight loss is a different story. It depends on your physical activity and input calories which you take on daily basis. Masturbation is bad for health and you should avoid. Now coming to nightfall question. Nightfall is a natural physiological process and has no harm to body at all. It is totally natural way of semen coming out. Hope it helps. If you need further, detailed and quick assistance related to any health issues in future, feel free to ask me a question directly from my profile. Have a wonderful time ahead.   Best Regards! DR. MUHAMMAD M. HANIF USA