I was masterbating and when I came I felt a terrible pain in my urethra like razor blades followed by blood. the pain has subsided but I have blood still present mostly after i urinate. I have had this once before in my 58 years of life. I am very healthy and I have never had kidney stones (that I know of) and again this has only happened one time before after masterbation. I have not changed anything in my regiment with sex so I am concern as the pain is still there and the blood (very lightly) is still in my urine.