One other thing to consider that has helped my wife and I as we have gotten into the lifestyle. We agreed early on that, while we have rules and boundaries, honest mistakes can happen and, within reason, they are not a big deal. For example, we are soft swap and my wife is quite bisexual, so we like play that is fairly intense girl-girl with softer swap between the opposite sex partner. One night we met a couple, and as we played, it was clear that they liked to swap partners. While they respected our soft swap rules, she clearly wanted to play just with me (and her husband with my wife). It was not ideal because, while I found the women attractive and had a good time, my wife was not that into the guy and really didn't have much fun. I noticed this eventually, but not as soon as a probably should have Afterwards, we did not argue or she did not feel betrayed. She simply concluded that 1) it was not a great sexy session for her, 2) it's really complicated to make the dynamic between four people perfect, so sometimes you will miss a bit and 3) no big deal, we move on and hope to have more fun next time
The reason I bring this up as an example is that I find that, despite lifestylers open minded views toward sexuality, it is still has a tendency to expose our vulnerabilities and self-doubt. As we play in this lifestyle, I think we have to accept that, like any other aspect of our life and relationship, each of us will make mistakes and misstep, but unless you truly cross a big line, it is no big deal and you learn from it and move on.