I'm a 66 year old male and until last year thought I was quite healthy. In May I suffered a mild heart attack. I had 3 stents put in and have since been very careful with my diet. However now I have developed a new problem, blood in my Semen. I'm on Plavix & Lipitor. Can this be causing my problem or is there something else causing it ? I am very concerned about his and my family doctor doesn't seem to think it's serious. Is it serious ?