I've posted in the past problems my wife had with rotation in our group class. The instructor had a number of couples at different times that decided to not rotate with the rest of the class, and the instructor just let it go. One beginner couple had been dancing together for maybe four months and ignoring rotation every class. Then the guy's partner didn't show for the class. And that night we were top heavy with leads. No words were passed, but during rotation, almost half the ladies walk right past the guy to the next lead. The guy was shocked!