Bad Girl Grading System A -- Totally bad!!! B -- Could be worse... C -- Wannabe territory D -- Way too nice! F -- Give it up, Mattie Brown! Mattie Brown has always prided herself at excelling at everything. And that's why it's killing her that she scored only 18% on a sex test! But she isn't going to take it lying down. (Well, maybe she will, but that's beside the point.) Her plan -- to proposition Cullen Slater, the neighborhood stud, for some hands-on instruction in how to make her sex life sizzle. Too bad it's her cute, nice-guy neighbor Mike Peterson who's lighting her fire....