The big group English lesson between Brian, Natalia, Friz and Sally in the film. Brian wants Sally to leave especially, but Natalia insists she stays so they can have a natural conversation. She of course brings up the topic of sex, which Natalia doesn't understand the English for. Sally eventually finds the German word.
Brian: That would be the one German word you pronounce perfectly.
They talk about how one can catch syphilis. Natalia mentions cups just as Brian hands her a cup of coffee.
Natalia telling Sally about Fritz 'pouncing' on her. She essentially tells Sally she's going to her for advice because she knows about men, due to her "many screwings". She also takes special time to describe Fritz as having "no respect for my father's library sofa".