Mia is the obvious aggressor in the relationship. Harry slowly succumbs to her advances and continues showing interest in her. The flirtation between the two quickly escalates when Harry purchases a necklace for Mia, all the while attempting to hide everything from his wife.
There is a scene in the movie that depicts Mia sitting on an unkept bed putting on the necklace that Harry had given to her. The movie never shows the two of them actually making love. However, it is suggested due to the state of the bed and the fact that Mia is wearing some sort of lingerie along with the necklace.
Is there any evidence that Harry and Mia actually had sex? Was this scene just a fantasy that Mia was having?