Allowing men in the UK who have sex with men to donate blood if they abstain from sex for three months has been successful, with no rise in HIV-infected blood
Source:
https://www.newscientist.com/article/2225154-new-rules-for-gay-and-bisexual-male-blood-donors-found-to-be-safe/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home