<s>[INST] I am mother of two boys,my bigger son, he is 15 years old and i have a strong feeling that he shakes his pennis because i have found some white spots in his underwear. Does shaking penis will harm my 15 yr old kid?what are the symptons of shaking penis? [/INST] Hello. I have reviewed your query and here is my advice. Masturbation is natural, normal and never unhealthy. It also does not affect your sons growth or intellect. But make sure that someone speaks to him about this and warm him from overdoing it. Safe frequency is three or four times a week. Hope I have answered your query. You can contact me for treatment options. Let me know if I can assist you further.   </s>