I met my wife (girlfriend then) in the apartment complex we were living in. One of her girl friend was trying to get us together. She told me to ask her where her mold was. Her mold was on her butt cheek. This friend also told me she had nice boobies. Sometimes I wondered how she knew, may be saw my girlfriend naked?
I did ask about one of my wife's girlfriend. She looked amazing fit, but then she's was Jazzercise instructor. They knew each other since junior high school. They went somewhere to help de-train race horses when the horses retired from racing.
She said her friend wasn't this fit when they were in school together. She did mentioned they did have sleep over together. Then let it slip that they had explored. Pressing further, she finally relented they had felt each other up. The most they did were fingered each other and nothing more (so she said - LOL).
After that I looked at her friend slightly different, but I never let on that that I knew about the sleep over.