My last visit to the blood bank scared the hell out of me! They tested my blood, and then said they couldn't accept it, and I have O negative, which is very much in demand. Then they gave me the telephone number of a doctor to call. Before calling the doctor, my mind raced over all the indiscretions I exhibited while I was single in sinful Southern California. I finally got up the courage to call, and the doc said the test was simply a false positive, and not to worry about it. I have given blood since then with no problems. One of the many benefits of giving blood is it lowers your blood pressure temporarily. This is a good thing for me, since I am right at 140/80, which my doc says is getting into the high range. I have thought about taking a blood pressure pill, but have read from several sources that this negatively impacts one's libido. Anybody heard this?