Back in the early 80s I was at the Indy 500 for practice the Friday before qualification. There used to be an area in the first turn called the Snake Pit. Pretty wild party scene where you never knew what you might see. My buddy and I were walking through and noticed a bunch of people around a van. As we got closer we saw two guys and a nude girl standing on top of the van. The two guys would hold the girl by the arms and lower her down the side of the van where there was a line of guys waiting to eat her pussy. One guy would lick her pussy for a few seconds, they would lift her back up and then lower her back down for the next guy. Not sure how long this went on before the cops broke it up.