The assumption is that you somehow know he is disease free...there is no risk of catching a disease.
OK - and how does that work?
Or is this a fantasy situation? Sure in a fantasy, of course I would.
But in real life there is no way of knowing a stranger is disease free - there just isn't, you either use protection or you take a risk. I'm the same as others posting here, when I was younger I took risks. I have blown a complete stranger at a rave. A might have been high as a kite but I was still aware I was taking a risk, I wasn't stupid enough to
assume anything.