Dear Welcome to HCM We understand your concerns I went through your details. Human reproductive organs are highly sensitive. The male penis is greatly sensitive to any changes. The restricted urethral passage also forces the penis to be highly sensitive. Most cases of penis burn are not STDs at all but simple simulations of the penis that have “got out of hand . Here you are complaining of frequent episodes of burning penis, after masturbation. Two or three masturbation cannot cause any direct health issues. A burning sensation after masturbation felt by most individuals is the result of poor techniques being used. Still other aspects like urinary tract infection and STDs cannot be ruled out. I suggest you to consult a physician for evaluation. If you require more of my help in this aspect, please use this URL. http://goo.gl/aYW2pR. Make sure that you include every minute details possible. Hope this answers your query. Available for further clarifications. Good luck. Take care.