My wife was really wild when she was younger (college and even more so in grad school). I love all her stories. I live through them as my college and grad school life was very, very dull. She doesn't like her past that much, but she is willing to tell me about it. None of the things she would do now.
Of course one friend was always the ring leader. None of the other friends would do anything if it weren't for the one friend getting it started.
Once she was driving with her friends (all female), and they decided to ride around totally naked. In the city. On a Friday night.
They regularly went skinny dipping in a rather busy place, albeit at night.
They flashed at bars any time they could.
And other stories that I can't really remember off the top of my head.
Her current circle of friends and family wouldn't believe any of it. She is such a reserved woman, so they think.