Dear Doctor, I have the norm of rubbing my scrotum on bed to get excitement. I have also found whitish color discharge during urinating, I am not sure, or I should say I dare not certain whether it is sperm/semen or protein being leaked. May I know how to differentiate it? Are they looked the same? It does not happen every time I urinate but quite frequent daily. The whitish color thing comes out the most when I rub my scrotum against the bed a day before. Sometimes when I tried folic acid with B-complex, it disappeared and my urine looked clear which I have just noticed it. I am quite worry because my friends told me it could be protein leaks. If it is, it means my kidneys are damaged. This issue has puzzled me which I am very worry day in and day out. In fact, I have been for blood test and urine test, in December 2014, everything was good. It makes me even puzzled. Please advise. Worry guy Lim