Having sex with someone who has HIV puts you at risk regardless of their sexual orientation, for example in Ireland 38.1% of people who contracted HIV were heterosexual. 9% were unknown. Yet gay men giving blood is still banned. Its an outdated discriminatory standard.
If anything, you are proving the point of the exclusion criteria.
Men who have sex with men make up a relatively tiny part of the total population, yet they are statistically speaking the group where the majority of
total HIV transmissions and infections take place.
According to the CDC page I linked earlier, men who have sex with men make up about 2% of the total US population, yet this relatively tiny group is associated with 72%+ of all HIV infections in the US among the 13-24 age range, for example. A large majority, and as such, men who have sex with men pose a greater risk of transmitting HIV through blood donation in comparison with other groups. Hence, their exclusion.
Sorry for going OT again. Let's shelve this discussion now.