Offhand I can think of 2 reasons:

1. Snyder v. American Association of Blood Banks
2. Jappell v. American Association of Blood Banks

Unfortunately, a significant number of homosexual males do not use adequate protection. Therefore the CDC and the Red Cross have adopted these policies.

Now I am going to get personal, for which I apologize in advance. You admit you lied to the Red Cross about having sex with a male when you were 18 and yet you expect us to believe you now when you say you've NEVER had unprotected sex.....

I'm sorry - but I find your credibility somewhat lacking.