I masturbate by rubbing my penis against a pillow;earlier I used to do it once a day or once in two days but now I do it only once a week or even less frequently,after masturbation when I urinate,the urine doesnt come out in a single stream,it sprays out a little. I searched on the net and I read that it is harmful to the urethra if u masturbate face down.Should I stop masturbating now and how do I know whether I have caused some damage by now?