I don't see monogamy as a prison. I see it as freedom from the pressures expectations and risks of non-monogamy. My ideal partner feels the same. I'm not a warden, but if you don't honor your promises to me, I will find out. I'm I'm sensitive, and observant. I'm also a real flight risk. I will drop a dude for the whiff of suspicion, early on. If something's not right I'm in the wind. Later on, when I know a man well, I'm more open to conversation, and my trust is more stable. However, once my trust is abused, I'm a ninja; I'm gone and hard to reach, like I was never there. I don't choose boys who need a babysitter. I choose men who allow me to relax and bask in their love.
And yes, it is possible to cheat on a swinger. You think swinging and other forms of non-monogamy have no rules to break? Ridiculous. I, for example,insis iupon a mutual right of veto. Once I say a potential partner is out of bounds, pursuit means I'm ghost. Example. I fell in love with a side dude. The rules got re-negotiated to reflect the new seriousness of our commitment. I was introduced, as his girlfriend, to a potential casual partner. I observed that she had unbelievably poor discernment regarding her choices in other men. So, I vetoed her. "That broad is gonna give herpes and HPV to the whole cipher. I'm not fucking anyone who fucks anyone who fucks her, and neither should you. I don't want her in the mix." He pushed hard to get me to re-consider her. She was sweet, and pretty, but stupid. I held firm. The answer was no. Choose. Her, or me. He couldn't have both. To my knowledge, he honored our agreement. A few months later she fled town on credible suspicion of inappropriate behavior with minors, pregnant by one of them. Every last one of them afflicted by the same two STDs. (Chlamydia or maybe crabs, and gonorrhea, if I recall.) After that, my word was final, never again met by push-back or resistance. The rules were, we swing together, but I might be willing to accept him being alone with a woman we had gotten to know, only we are fluid bonded, with everyone else it is condoms every time, no scandal, no disease, no crimes, no pregnancies, no lies, and either of us could eject another partner from the circle at any time, with or without a tangible reason beyond "something is not right". I know he wasn't fully comfortable with me being able to say he could not lay with someone he wanted, but he loved me, and he wanted to keep my love and commitment, and agreed to swallow that jagged pill.
Every kind of relationship has rules. Even a one-off is supposed to agree not to track you down and contact you again. Wherever there are people and rules, there's a chance someone will breach expectations. That's life. But I'm not opening up my life and body to a man I don't trust. I trust my guys. I trust them, until I don't.