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...