Probably any early 90's gay gangbang is about halfway there.

Even a modern gangbang with condoms has a greater than 50% chance of infection if there are 15+ tops, assuming the tops are HIV+.

There are still gay porn companies in the US producing bareback including gangbangs ("Hot Desert Knights"?) and I doubt anyone pretends they were all HIV-.

As for the "execution' theme: that's way too close to "snuff" for porn to touch. Hollywood might though.
_________________________
"If they can't picture me with a knife, forcing them to strip in an alley, I don't want any part of it. It's humiliating." - windsock