Since past 15 yrs,i masturbate by lying my face down and rub my pennis against the bed till i i satisfy or till my semen leaks. i enjoy this act very much. I read about this on Internet some people say this does harm in future and some say its not good practise as it effect future sex life. i am realy confused and worried about my Habit. And when i try to it though Hand I am unsmle to fantasize hence i fail to Masturbate.Please help me on this.