Hell when I was a young man, I had girls flocking around me at assemblies and conventions. Later when I was dating, my (then) girlfriend was giving me head in the front seat on the way to convention while grandma was in the back seat "chaperoning". Our chaperones, never knew what we were doing, it was ridiculous what we got away with right in front of people.
I was a chaperone for people later, and I was tough as hell, wouldn't let them do squat, especially if I didn't like them. The couples I liked I would show up with and then leave them alone. One couple I gave condoms to, because I didn't want them having a kid. My rule was always don't ask, don't tell.