For around a month, my penis has been hurting when I urinate.it normally hurts right when I'm about to finish doing my business, and for around 1 and a half seconds after.  At first, it was a mild and occasional pain, but now it happens every time I go and it hurts more. I also find that I urinate more often. I'm a virgin, but I do masturbate. I don't eat too much salt, so I doubt it could be a kidney stone. What could be the cause? What are the treatments?