I honestly don't care how anyone derives pleasure. I, personally, become deeply connected with one person at a time and all of my partners have been the same. If someone else's experience is different, I am not judging. I would simply prefer those things stay in the bedroom.

If I had to pick an "issue" with it, it would simply be the people trying to sell it to me as something besides swinging. I think it's being rebranded to make it more palatable, but I don't see the difference between "open marriage" and "swinging".