I Am My Beloveds by Jon Papernick

Ben Seidel wasn't sure how serious they were when he and his wife, Shira, discussed having an open marriage. But when Shira announces that she is going on a date with Liz, any ambiguity evaporates. Suddenly, every day is new terrain for Ben, navigating between keeping things together with Shira and exploring new partners. And when one of those new partners begins to matter to him more than he ever anticipated, he discovers that the complexities of this new life are only just beginning. Bracingly honest, refreshingly sexy, and deeply empathetic, I Am My Beloveds is the work of a superior storyteller, making real a lifestyle that might be as close as your own bedroom door.