My husband and I have been together for 10 years. He currently has a girlfriend he’s been seeing about 6 months. She lives with her husband (who also has a secondary partner) and two children. I have dated a bit but am not currently interested in anything outside our marriage. We also had a relationship a while ago where a close friend of mine had a purely sexual relationship with my husband for a little while, and for the next three years, we went through periods of being a triangle, a V, all just friends, she lived with us for a bit. She moved across the country and now is in a monogamous relationship, and we are all good friends. The most drama that has ever happened is that a guy I was into slept with a girl my husband had slept with. That kinda sucked. Thankfully I had my husband to cheer me up.

I hope I have the privilege of meeting a success-case such as yourself in person, who's not shy about discussing it candidly, because I have a lot of curiosity about it and how it works.

Not the person you're asking, but given your categorical prior assertions, I cannot help imagining a mocking tone in your question.