I too was overwhelmed with John Holmes (Johnny Wadd) movies. Once I got into the Navy where I saw a LOT of dicks, this one slim guy on my ship packed a dick that was BIGGER and just as thick as John Holmes. He loved to intimidate me me because I
was so young and uninhibited, so I stared frightfully at that huge thing. One day I got the chance to rub the side of my hand against his crotch when he got close enough and he pretended he was offended. Soon afterward I heard one of the queens on the ship sucked him off one night and there were indications something did happen.
Now - back to John Holmes. Accordingly to the "Wonderland" movie, it was inferred that John might have caught HIV from getting fucked. It was assumed that due to his lifestyle (hard knock drug trade), that had to take it as well as he could give it.