I believe BERG may have an opinion on this.
"Men who have had sex with men have an HIV prevalence 60 times higher than the general population, and the HIV prevalence in potential donors with history of male sex with males is 200 times higher than first time blood donors and 2000 times higher than repeat blood donors. "
http://hotair.com/greenroom/archives/2010/08/06/gays-and-blood-donation-sacrificing-public-safety-for-political-correctness/