My ex and I played with other men several times, the hardest part emotionally/jealously wise was playing with my best friend, very weird. When it was a stranger, it wasn’t a problem, mentally or emotionally I had no problem.
Now, wife and I playing with others, it’s much more of a turn on watching her being played with. She constantly makes the comment of not wanting to have sex with another guy, and she wouldn’t want to see me have sex with another woman. As I’ve told her many times, I don’t really want to be with another woman, unless it’s a MFF scenario, but to watch her with another man, regardless of race, is very sexy, and quite a turn on.