Maybe they are swingers. We have a lot of that going on these days.
Sure, it’s possible. I’m not sure how that relates to my response to the previous poster. She’s still an adulteress, and according to her story, she was allegedly attacked by her adulterer. Swinging is even more disgusting than simple adultery, because it’s getting consent from all parties who neither respect themselves, nor thier spouses, and openly engage in dangerous, unhealthy, and socially destructive behavior.
I’m certainly not an expert on swingers, but my impression is that swingers have rules governing how this sort of thing goes precisely so that your spuse isn’t boinking random strangers and bringing an STD epidemic back home.
A lot of couples are able to work things out after adultery, but “I got to close to someone at work” or “He was an old flame from high school” is on a different planet entirely than “He came over to fix the dryer and I boinked him without even checking his name tag.”