Relationships grow stale over time, it is almost bound to happen. The few exceptions have other drawbacks, your average Bonny and Clyde might make it a little further but it is a bloody path that doesn’t exactly lead uphill. An open marriage might work for a while, but that grows stale even quicker once you realize it is not the sex you crave, but rather the taboo.
What use is cheating if your husband is okay with it? Heck, if he even likes to watch? No, that would never work. And in a weird way it is great that my husband is so uptight, it makes it so much better to know I am a bad girl and that he has the moral high ground. I need that, I need to look at him with love in my eyes after I just looked at someone else with sex in them and feel his arms around me as we talk about our days, cook dinner and fall asleep on the couch. Maybe even sleep with him, my own juices not the only lubrication.