"....true there isn't screening in place for all types of people"
Is it really now? As a blood donor, I'll just note that there was a ten year wait for me before I was cleared - due to the fact that I like red meat and ate some while I lived in London in 1994 - and there's a six month wait if I change sex partner. I'm not sure how often my blood was tested when I was an active donor, it's possible they tested it once a year regardless of what I said on the forms I filled out each time. My mom could never donate at all because she lived in west africa in the late 60s and managed to get malaria twice.

Aside from that, the non-sex activities are hilarious.