* sexual history involving the exchange of money or drugs for sex sexual history with someone who has exchanged money or drugs for sex * amount of time spent in the UK & Europe since the early 1980's (BSE risk, aka mad cow disease) Other reasons that I can recall from the questionnaire that may cause rejection (some permanent, some temporary): Combined with the fact that the HIV screening tests done on donated blood cannot be guaranteed 100% effective, they choose to exclude this and other identified groups from donation in order to reduce the risk. With regards to the exclusions of homosexuals, the gist of the issue is that statistically speaking the incidence of HIV (and other STI's) in the homosexual male demographic is a fair bit higher than in the general population. This pamplet from Canadian Blood Services hits on many of the reasons someone could be turned away. The word "anal" does not appear on that entire page.
![can gay men donate blood usa can gay men donate blood usa](https://dkt6rvnu67rqj.cloudfront.net/cdn/ff/Om5U-UmvcZr2c1WvOqGeVKCVEuW1wH9nSCIZJQo_qow/1579396825/public/styles/600x400/public/media/int_files/1020744.jpg)
instead, or be more specific (and avoid the word "about"). " and other broad posts don't belong on TIL. Starting your title with a why/what/who/where/how modifier should be unnecessary.
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