I am in a marriage that had strict monogamy for 20+ years and then a while back we opened things up a bit. We only see other people together — no separate dates and it allows us to have both a sense of fidelity and of exploration. I don’t believe this is typical though. I think most people are either classically poly, do the swinger “wife swap” thing or keep to monogamy. I’d love to see more written about other forms of monogamy +. I’ve started writing about it some, but wish there was more out there on the topic.