No, I don't think 57% is enough to make such drastic claims of human nature. And considering statistical variance and I suspect a low p-value, I wouldn't hold this up as the definitive evidence that humans are, by their very nature, non-monogamous animals. Especially given how complex human relationships are. It also seems like an unfortunate mindset to approach a situation with the idea that "well, someone is going to cheat here, so it might as well be me."
Which I'm sure is not what you mean but is certainly what could be interpreted. And nowhere did I say you were looking to use Gaf to fix anything. I am saying that discussing this on Gaf has a very low probability of changing anyone's mind on the matter. From the responses of everyone else, it doesn't appear they have changed their stance on the topic. But it is understandable that you're getting defensive and I want to make clear that I'm not being critical of your choices or feelings on the matter.
What does seem clear to me, and is echoed by most posters, is that you need to discuss this with your partner. Which you, yourself, have even mentioned.
