Frustrated by the waning passion in her marriage, Billie starts journaling about — and obsessing over — her wild erotic exploits with ex-boyfriend Brad.

Billie's emotional rollercoaster of a day turns into an arousing night out when Cooper attempts to reignite the spark in their relationship.

While Cooper decides to check out the competition, Billie dwells on the passionate highs and soul-crushing lows that defined her romance with Brad.