The policy still doesn't add up. They really should just ask anyone if they've had unsafe sex outside of a monogamous and std tested relationship in 3/12 months.
I could very well have had sex with 100 women in the past 3 months (as a man) and been unsafe with all of them. Yet, they don't seem to be the least bit worried about that scenario.
While I support allowing homosexuals to donate, I don't think your comparison is fair.
Having 100 random sexual encounters with randomly sampled women leaves you approximately a 50% chance of having unprotected sex with someone who has HIV. Not to mention, HIV may not even be transmitted even if you have an encounter.
On the other hand, after 100 random homosexual MSM encounters, your chances of having had unprotected sex with someone carrying HIV is 99.99997344%.
MSM puts you at a much higher risk for HIV. That's fact.
I could very well have had sex with 100 women in the past 3 months (as a man) and been unsafe with all of them. Yet, they don't seem to be the least bit worried about that scenario.