He brought it up a couple of years ago, as an alternative to divorce. We've been married 26 years and have issues like trust and college/high school kids.
We've played twice (both times with unmarried couples), and experiences a mixed bag of positive and negative feelings from those adventures. We've only met one married couple, but were grossed out by their un-fun personalities (mousy and manic), and never got together again.
We've learned a lot about how this works (and doesn't); and now realize our trust issues need more attention; and swinging again for now remains a fantasy.
Tasting this lifestyle has been a positive springboard for opening our hearts and minds to each other again, and realizing the depth of our commitment. So we lurk here occasionally; curious, fascinated and trying to keep our minds open to possibilities.
Dori