Last time I gave blood, that was in fact one of the questions, more or less... iirc it asked about unprotected sex in general, though in a tighter time-frame.

Last time I gave blood, that was in fact one of the questions, more or less... iirc it asked about unprotected sex in general, though in a tighter time-frame. Of course your particular wording is just opening a huge can of worms with "what does 'people you only know casually' mean?".