Mark and Mary's meet-cute occurs at a neighborhood drug retailer, the place she is busy shopping for a being pregnant take a look at, and he has to make an effort to remind her they met in faculty. After asking her out, he accompanies her as she takes the take a look at, and upon it exhibiting damaging, she agrees to a date. One yr later, they've fallen deeply, passionately, head over heels in love, and their whirlwind romance results in marriage. So when Mary abruptly requests they open their relationship to “moral non-monogamy”, Mark is taken without warning, however agrees to attempt it. And that is the place this story actually begins.