My wife and I have discussed this subject at length on numerous occasions. We both have agreed that if either of us ever starts to get jealous in the LifeStyle before, during or after play, we will drop out until we get our issues resolved.
To us, jealousy has absolutely no place in this LifeStyle.
That being said, I have yet to experience any sort of jealousy while watching my wife with another man, or several men or other combination. It's a hell of a turn on. To me, it's like watching a porn movie being made and my wife is the star, but the cameras are missing.
She has stated on more than one occasion to me that seeing me with another woman or women or group is a big turn on for her too. It makes her hot to see me having fun.