Hello Sir, This is Praveen kumar, age 24. I'll masturbate several times a day since it became an habit which I can't resist myself. I've never faced any issue. Yes, This can effects me in the future however recently I had a sexual intercourse with my girlfriend for the first time in my life. The weird issue I faced is I'm feeling uncomfortable while doing it, I stopped doing it and later I've noticed a black spot bottom of the opening of urethra's head. I'm feeling some burning while masturbate.