Becca and Mark have been trying to have a baby for years. Technically, there's nothing wrong with them. They fight a lot, but what couple doesn't? Everyone tells them to relax and it will happen. The next logical step is in vitro, but that's invasive and scary. If it isn't physically meant to be, why force it? The conundrum leaves Becca feeling anxious, depressed, and alone, until the day her neighbor Macy, a wild-spirited music producer, introduces her to Heathcliff, an undeniably attractive and attentive photographer. Becca's loins are awakened, and she wonders whether she and Mark are truly compatible. When Mark's mom, a sociology professor, admits to swinging and preaches about the social imposition of monogamy, an idea brews: what if they went outside of their marriage? Before taking the plunge and making a baby in a lab, they need to know, are they truly meant for one another?

They make an agreement: one month, one exception.

Will their relationship survive? Is letting go of each other, their dreams of being parents truly the secret to getting everything they've ever wanted? Or will their desires change completely?