I don’t know if this counts but I have seen teenaged boys do some pretty strange and perverted sexual things with each other. We had literal circle jerks at school and at parties more time than I can count. Sometimes, there would be 25 or more people participating. We also had penis length contests with measuring tapes and official scorecards. I have heard stories that those types of things happen all over the place.
However, I seriously doubt that there was any attraction going on. It was just all fun and perverted games.