Very nice to explain ! I actually have a huge collection of 8mm and super 8mm reels of some very rare and truly amateur sex from the 40's through the early 70's ! Most of the recordings are of swingers that were locals from all around the 5 Burroughs of New York! I did notice that most outdoor scenes of the characters walking in the streets to get to the location of their swinger orgies were fined in Brooklyn since I was born and raised there, it was so very obvious to me of there local! Lol. Btw....I view these on a very old Bell and Howell projector I inherited from my grandfather along with a ew of the stags that got me into collecting this amazing hot vintage smut!
to the newbies: before there were Nanos, Blackberies, Iphones, CDs, DVDs, VHS or streaming video, there was somehing called 'film' and this was containered on reels (these look like a BMX wheel only much much smaller). These reels were run through a projector which emblazen the frames at about 16fps onto a screen, bare wall or in many cases a white bed sheet. This is such the case with 'loops', alot of time they did not contain recorded sound, only picture... this sound was added afterwards... sometimes long long afterwards which is more often the case where 'muzac' was supplied in its place. i hope this clears thing up a bit.