I am sure I have posted about this particular situation before, so if you have heard this story feel free to move to the next post.
There is a couple who are basicaly in a polyamouros relationship with another couple, they all live together. The husband of couple one and the wife of couple two one no longer want to swing and are happy as a foursome, but they did give the other spouces approval to swing, but with a select group of people.
So Hubby of couple two and the wife of couple one do play together. We have gotten to know all four of the people and consider them good friends and very trustworthy. They prefer threesome with another woman, but ocassionally will do a full swap. I fall into the threesome catagory right now.
We have also all agreed that if we are at a club/dance or party and the hubby of this couple and I want to play together then that is fine with all of us.
So for the most part I would never include a married man into our play dates unless I knew his wife and we were all comfortable with the agreement