I cant because even though I am healthy I have amnesia which creates problems if they were to sue me under product liability laws.

So you can't give blood because you may not remember if you are a gay man/have HIV/had surgery/been to a malarial area e.t.c.?
Interesting, that one really hadn't occurred to me.

Yes but many of the things that would have stopped me, like piercing or tattoos are things that I hate. Having surgery is something that even I could remember. Travelling is also something can be remembered.