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But all of this is explained in the game. The torch that is Kendra, that ignites Anna's sexual desires, the fuse that is Anna's powder keg, is Kendra. Without her, Anna would not have unleashed her sexual desires. I'll counter that the powder keg was always there with or without Kendra's meddling in Anna's life. Can't have a Ka-Boom if there isn't the Ka-Blam waiting to be armed with a fuse. Got to remember the only thing that kept Anna from going off was Anna's socially imposed beliefs of what made a good wife. The devil was always lurking in the dark of the stairwell when Anna and David first met.
We can't say what events would have occurred without Kendra's mischief. We just know Kendra put things into motion at this stage in time. Didn't take much effort for Anna to slide into questionable behavior. Fact Anna's teasing of Marvin has little to do with her relationship difficulties with David. And it's safe to assume, whoever it is if they flatter Anna's ego and sense of self-worth, she's going to get aroused even if she wouldn't have acted upon it.
A weakness in a dam is still a weakness that may or may not fail... just something may come along that exploits the weakness. Even without Kendra's involvement, there still was always going to be Chris. It's not that all of a sudden Anna changed her mind about Chris--just the circumstances changed. Anna in the pasted could rely on "being married" that kept her faithful not the sense of love and devotion for David (those were only secondary considerations for Anna).
Does that all mean that with or without Kendra, Anna was going to cheat? No, not at all. But certainly, the possibility was always there and something else could have given Anna the excuse. Worst is that all it takes for Anna to go off the deep end is an excuse. Suppose folks can have different views about Anna's moral character if it only takes is an excuse, but its damning, nevertheless. And all that doesn't take into account the simple fact that other factors, like midlife crisis issues doesn't push Anna over the edge. Am sure a few people have witnessed that happening