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.

Billie's outing with her fellow moms stirs up memories of Brad — and has her making a beeline for Sasha. Cooper unloads his marital worries.

As her thoughts continue to drift back to the connection she shared with Brad, Billie proposes a plan to put Cooper's mind at ease about her journal.

Billie seeks help to untangle her feelings about her marriage and Brad. Cooper receives a tempting proposition after a rewarding day at work.

As Brad broods over the mistakes he made with Billie, she and Cooper bite off more than they can chew in a bid to spice up their marriage.