They've actually slightly improved this lately, they ask about what they determine are risky sexual behaviors (ie hookups) with no gender attached now. The one thing is that you can't be actively taking PrEP and donate because it would obscure the HIV testing results (that they ought to be doing every time, multiple times!).
Source: https://www.redcrossblood.org/donate-blood/how-to-donate/eligibility-requirements/lgbtq-donors.html
You could look at it another way- a solar power screen on a phone won't charge it all the way, but as a secondary source of power that is essentially always on when the sun is up or other light sources are on, it reduces the battery drain over the day, meaning less charging needed at night.