Geimer said Polanski began having intercourse with her before asking her if she used birth control and when her last period was.
She testified that he then asked: "Would you like me to go in through your back?" Then, he started performing anal sex on her.
In the years since her rape, Geimer says she has forgiven Polanski and does not believes he should face further jail time.
Also today, some of Europe's top directors, including Jean-Luc Godard, signed a petition at the Cannes Film Festival in support of Polanski.