It's great you've worked it out. Sometimes she liked to play solo, which was not hot and not. Happy you've figured it out. I do love knowing she was getting fucked over and over.
Personally, I had no issues with her casual ones, but the deeper ones were challenging. Too much split time and her feelings were more divided. Hard not to be jealous. Definitely casual was better.
I've had a range of reactions. Definitely a turn on. Sometimes a bit jealous and possessive. Still turned on. I've cum many times watching, one time spontaneously as two guys groped and humped her while dancing. That was humiliating.