I have 2 lots of couples in my friendship group who have an open type arrangement to their marriages. I know its always gone on but people are becoming a lot more visible about it all. One couple is entirely open, going off and sleeping with other people as long as the other partner is aware. The other couple go on Apps and find like minded couple and basically swap partners , they largely do this together and not apart. They meet up with couple, go out and get to know them and then book a room together if they all like each other. Do you know others doing this and what kind of long term impacts do you think this will have on their relationships. Are you doing this or know others who are into it?