<s>[INST] now I am 20 years old and I am in the habit of handshaking of penis for 6 yrs. I am very thin [height : 168cm but weight : 48 kg]  also I hand shake my penis once in every 15 days. Is it dangerous for my health. please advise me what should I do to avoid this habit. [/INST] Degree understand your concerns went through your details. I am surprised you masturbate only once in 15 days, and you call it a habit. Masturbation is normal and is natural and not all all unhealthy if you practice it moderately. Adolescent people at your age masturbate every day, and they do not have any healtChatDoctorplaints. You should stop worrying about this. Your underweight could be due to nutrition deficiency. You could consult a physician to rule out any physical problems, and then you should take proper nutritious diet for improving your health. If you still need my assistance in this regard, please use this link. http://goo.gl/aYW2pR. Please remember to describe the whole problem with full detail. Hope this answers your query. Available for further clarifications. Good luck. </s>