In my youth i would say one night stands would be the best choice for all couples new to the swinging lifestyle. But i think the cuck thing would also fall into that thinking. When your starting something new and untested why add the possibility of one or both getting infatuated with a new sex partner. When you have enough time and experiences behind you and your relationship is sound why not. You can never have too many friends. There is a danger i believe if you limit it to one person. That is obvious having sex week after week it would be unnatural not to develop real affection for each other. Unrealistic to not mentally make comparisons between the two men in your life. We had friends from swinger groups that we socialized with even to the point of family vacations with all our children. Of course there was no hanky panky on those jaunts. It really depends on those involved, if they control the emotions. I lean towards not limiting to one extra lover for two reasons. #1 being my sexual desires. #2 being LOVE you can never control that. Frequency often leads to love. If it should enter the picture the best laid plans or intentions are frankly blown to hell. It's a game changer that could effect the families of all those involved. It would be easy to say if you feel or see it developing walk away, the problem is by that time it's often to late.
In short having only one long term lover adds some extra risk but the lifestyle is a risk. Like everything you only should choose your path, you're the one who will have to live with it. I'm sure there are many who have made it work, just as many as those who had it blow apart.
