Motifs in the James Bond film series the degree to which Bond girls are pivotal to propelling the plot forward varies from one film to the next. Five of the Bond girls are "bad" girls (or at least working for the villain) who turn "good" (or switch sides) usually due to Bond's influence. Bond has fallen in love with only Tracy di Vicenzo in "On Her Majesty's Secret Service" and Vesper Lynd in "Casino Royale", but both of them die at or near the end of the respective films. Roald Dahl, a screenwriter of "You Only Live Twice", said he was given a formula to work to
Bond girl di Vicenzo, and sleeps with Ruby Windsor, a patient he meets in Blofeld's hideout while posing as a genealogist. In "You Only Live Twice", Bond mainly has a relationship with Kissy Suzuki, but also romances Mariko Ichiban, as well as another a girl. Several Bond girls have obvious signs of inner turmoil (Vesper Lynd or Vivienne Michel), and others have traumatic pasts. Most Bond girls whose characters are allowed to develop in the course of the story are flawed, and several have unhappy sexual backgrounds (Honey Ryder, Pussy Galore, Tiffany Case, Vivienne Michel, and Kissy Suzuki, among others). The inspiration