Mating in Captivity by Esther Perel
But I just never made the time to read this first book by her until now, and I think overall part of why I love her work generally is because curiosity, compassion, humor, and a lack of judgment are traced throughout all her thinking, leading to a more expansive understanding of what makes our relationships tick not only with ourselves but with others romantically, sexually and emotionally in mating in captivity