General Discussion
In reply to the discussion: Blood bank in Florida still turning away gay donors after terrorist attack [View all]Yo_Mama
(8,303 posts)One is that many individuals with risky behaviors are in denial about them. Sometimes they have a coincident drug/alcohol problem and don't even quite KNOW about them.
The second is that it is not just risky behavior that defines risk. It is also the infection status of the population with which the behavior occurs.
It is not anal sex that gives you HIV, or hepatitis, or syphilis, etc. It is unprotected anal sex with someone who is already infected.
Because the infection rate in the MSM population is so much higher, delineating purely on the basis of sexual behavior would not provide the same risk reduction as delineating on population-at-risk and risky behavior.
In the future, if current risk reduction techniques succeed, your suggested approach may well be the best. Right now, it would cause more transmissions.