Property or slave? Yeesh. That logic is crazy. Imagine someones wife saying "I am going to fuck the neighbor. I am not your Property or your slave" Guys, the world is full of women. You don't have to put up with this. You can't share your burdens don't let other usurp your joy.
"Property or slave? That’s a wild leap. Imagine your spouse saying, 'I’m going to sleep with the neighbor because I’m not your property or slave.' Gentlemen, the world is full of women. You don’t have to tolerate this kind of behavior. Don’t let someone else’s actions rob you of your joy or burden you with their choices."
Crazy logic and a wild leap, hmmm, that's an interesting viewpoint. I can't speak for you, but I live in a world where every person has a right to agency over their own body and decisions. Being married doesn't change that fact. Marriage isn't about owning your spouse or telling them what is "permissible" or what isn't. It's about sacrifice and compromise, because you have love and respect for one another and a sincere desire to live that life together as equals.
But that's the real world, my discussion was about this particular story. This story started as a loving couple whose husband wanted to dabble in something kinky. Dan asked her to be daring and naughty, Sarah wasn't really into it but she wanted to make him happy. Once Sarah tasted the forbidden fruit and knowing it turned Dan on, made decisions to keep pushing the envelope. And Dan was there every step of the way, he had opportunities to say "I think you've gone too far Sarah. I'd like us to stop" or "I think we should communicate Sarah, this isn't heading in a direction I like" but did he do that? No he sat back and got a chubby watching Sarah fall deeper into his and eventually their shared fantasy. Sure he made half-hearted appeals, and talked around the subject that was bothering him, but he didn't communicate.
On the flip side, Sarah's no saint, she saw the signs even if she didn't want to admit it. She got a taste of great sex and manipulated Dan on a few occasions and omitted things bc deep down she knew it was wrong and that if she told Dan, he might have actually said "I want to stop." However you do have to consider the fact that she's been groomed from the beginning by Lester, psychologically programmed over a long period of time to crave what Lester is dishing out. That doesn't make her actions excusable, but it does provide a basis of why she isn't thinking straight.
If anything this is a cautionary tale of being careful what you wish for because you are going to get burned. Fortunately I don't conflate fiction with my reality, I don't project/insert myself into any of the characters, I read the facts as written and offer my opinions and analysis of the fiction. I only broaden my views when others try to kink shame someone or tell others how they should feel, think or believe. I'm not perfect but I do try to keep my opinions objective.
As to your question my answer would be "don't let the door hit you on the way out."