I am on the no-donor list in my county's blood bank too for a really stupid reason - a lab error. The first time they tested my blood it tested positive for HIV, so they ran it again and it came out negative. They sent me a certified letter stating that the test was "false positive" but I still needed to come into their office for counseling. I was young, naive, and afraid that the test meant I was "pre-HIV" or something like that - even though I was married and in a so-called "low risk group" (I agree with your post though that anyone having unprotected sex is high risk, no matter their sexual preference).

When I went in to talk to them, they were very stern with me. I was told that they had to throw away my blood and I was never allowed to donate again. They doctor at the blood bank said I should follow-up with my own doctor, which I did. My doctor told me that lab errors aren't uncommon for the blood bank, and not to worry. That was over five years ago and I have had two HIV tests since then (with both of my pregnancies) and have been fine. I figure that it's just their loss... (I don't think they can deny you a transfusion because you don't donate)