The running idea is that AWALT is the truth, and there's no argument from me on that. At the same time, human behavior is never guaranteed. Statistically speaking, not everyone dies from a deadly disease or gets into an accident when driving recklessly.  

As such, it's not the case that every person cheats. They all could but that doesn't guarantee that they will. Some people don't while some people do.  

There was a great post by /u/RedPope today over on TRP that got me thinking about it. If you haven't read it, I'd advise you to check it out. What got me thinking was this: The comments virtually all agree that AWALT, and this is just another confirmation. But imagine she never cheated. Would anyone be surprised that a strong follower of TRP could keep a woman's commitment? No. But, alas, we know that's irrelevant to her decision to stray.  

So, what happens when a woman stays loyal to her LTR/Husband/Whomever's turn it is? When a woman who has enough opportunity to do so declines, what does our knowledge tell us has motivated that choice?