How many men does it take to find true love? When Delilah Darling reads a survey revealing that most people have 10.5 sexual partners in their lifetime, she begins to feel like a tramp. She's slept with nineteen men so far—almost twice the national average. During a self-help moment, she vows to cap her "number" at twenty, swearing she'll save her last spot for the right guy. But after losing her job and having a wild night on the town, she falls into bed with Mr. Wrong. Unwilling to up her number, but also unable to imagine a life of celibacy, Delilah does the only thing a girl in her situation can do: she tracks down every man she's ever slept with in a last-ditch effort to make it work with one of them. A hilarious romp through Delilah's past loves, What's Your Number? shines a spotlight on every woman's dirty little secret and proves that, when it comes to matters of the heart, sometimes numbers tell only a fraction of the story.