The main theme of the movie is about a burglar who unwittingly steals a married woman personal diary, where she wrote about her sexual fantasies and desires. He is shown reading the diary several times throughout the movie.
Man and woman briefly have sex in the film. Some thrusting and no nudity. Then when they start to dress up, woman's breasts are clearly visible, while pubic hair is partially shown in the shadows. This is seen from some distance. Also, outline of man's buttocks is very briefly shown.
Another longer sex scene. It starts with main character groping woman's breasts then unbuttoning her blouse. Then the scene quickly cuts to them in bed, fully nude, having sex. Some thrusting, but sounds are muffled by movie's ost. This sequence is strongly sensual in nature.