When Germain visits his wife's museum, we can see various artworks made out of sexual things, including a painting of a Swastika made out of penises, and sex dolls of various dictators, including one of Hitler.
Claude imagines Rapha's parents having sex; the scene is in the dark so we don't see much other than a brief glimpse of Esther's breast.
Rapha mentions to Claude that apparently Germain's wife owns a 'porno shop'.
During an argument, Esther accuses Raphael Sr. of going to a 'hooker bar'