Related to my prior post above, I'm reminded something that happened a few years ago.
We were with a group of five friends (one other couple, and three single friends), riding together in the couple's mini-van to a local hockey game. My wife and I were in the rear seat, three of my buddies in the middle seat, and the couple owning the van in the front seats. At one point in the trip downtown to the arena, my wife gets this weird look on her face. I asked her if anything was wrong, and she said she would tell me later.
Once parked, as we were walking to the gates, she slowed her pace, so we dropped back from our friends, and she leaned in and whispered to me "I just realized on the way here, that I have slept with every guy in the van!" She was kinda ashamed because she felt kinda slutty with that realization, but I quickly told her I thought it was hot, and she brightened up.
Later during the game, she leaned over to the friend she had currently been ...... with, and he got this funny deer in the headlights look, but then nodded and grinned.
After the game, when we finally got back to the couples house, and back in our own cars, I asked what that was about, and she said, "thinking about fucking every guy in that van got me so horny during the game, so I invited him over so you two can take care of me tonight! Don't plan to get much ...... tonight!"
Needless to say, it was a long and exciting night, and we all slept in late, before doing it again!