It's on the NYT Best Seller list with the following summary: "In a future not that different from our world, a couple living in a town where residents both serve as prisoners and staff a prison wrestle with monogamy."
Really? That's what you took from the book?
Yeah, they wrestle with monogamy, but the sex is more something to link them to the greater plots of greed, corruption, desperation, and for-profit prison systems.
I reviewed it back in Aug if people want something a little more accurate than a book about a couple wrestling with monogamy while serving as both prisoners and jailers.