This reminds me of a boss I had ages ago. He was a real outdoorsy type but his wife wasn't so he'd always bring along a woman when he did camping, hiking, etc. He walked into my office one day to tell me to convince my wife to go camping with him. She did but ended up actually enjoying camping so they always went on outdoor excursions together until I became his boss.
I have stood watch outside of our SUV in a bar parking lot while my wife had sex with a guy in the backseat. I have also watched from the front seat and even driven around a couple of times while paranoid married guys afraid of being caught fucked my wife. All very hot!
As I learned early in our marriage, when the wife dresses like a trashy whore she doesn't need me to tell the men they can fuck her. It's a given and they're just trying to find a way to ditch the wives/gfs to make it happen. Usually I was the one who was told to entertain the wife/gf until they got back.