@sim I have more respect for swingers than cucks in open relationships. At least both people are getting laid.
To answer your question, a lot of women are permanently ruined and unable to pair bond after getting pumped and dumped for 10+ years, so the only way to have a long term relationship is to cheat.
Being a swinger is better than cheating behind the guy's back or wanting an "open relationship" and having a boyfriend on side. Again, at least with sex parties both get laid
This just seems like having an open relationship, but hooking up on the side at a sex party. I'm not sure there is much of a difference. Especially if the guy in question isn't interested in hooking up with others.