I'm afraid, that it is not bullshit: Anne fucks other dudes from the beginning of the game with the permission of MC, even she fucks under MC's inspiration, doing her best to please(!) MC, but this was not a mutual agreement. So Anne reckon MC's adventure during vacation as cheating. This is why she got angry, when MC cheated her with her girlfriend Nicole. Later, she appreciated the lack of the balance (she didn't know about MC's affairs), and she commended Nicole to MC, during her trip to New York with Kenny. During the game she encouraged MC to join to one of her threesome swinging, asking him, why he didn't do that. In the 9th chapter Anne made even a trial of cuckolding in a bar, as she was witness of MC's affair, and she consented as MC renewed his acquaintance with his ex. If you omit one or the other scenes, playing the 3 main routes (swinging, cheating, cuckolding), you would have other conclusions.