I absolutely disagree with what you've posted AiCee it's got nothing to do with "common sense". It's to do with decency and the ability to walk away.
I think it is a bit .. romantic, for want of a better word, to think you can divide people up into neat categories like "decent and willing to walk away", or not.
For sure git faces exist. For sure paragons of virtue exist. The rest of us walk on the less certain terrain between those 2 extremes.
I'll take common sense any day of the week. It has proven a rather useful vaccination against a popular stance of:
-if you trust each other then you're impervious, anytime, anyplace, anywhere.
- if you trust and lose the bet then your entire relationship was a mirage so you've lost nothing and cleaning up the rubble of a formerly happy relationship is just a case of not delaying the inevitable.
-if as a couple you make any form of temptation insulators part of the package then you don't trust each other, meaning the relationship is fucked up anyway, so might as well give up now.
Given that tiny humans tend to stand alongside their parents in the rubble of what was a previously stable enough, happy enough relationship, I tend to err on the side of caution when it comes to assuming that either my husband or I have "decency and willingness to walk away" written through us in the style of Blackpool rock, no matter what the circumstances, regardless of any inhibition lowering factors. Given the stakes for the voiceless, powerless child in the mix, I don't see any moral high ground in jettisoning "keep common sense on the table at all costs" and claiming a more self congratulatory label for myself.
I'd rather assume that my feet carried a risk of being a bit clay like if push came to shove in a context where I hadn't taken immediate protective and avoidance measures. Because IMO that sort of common sense powered "defensive driving" in the marital car is my child's best bet that I don't sleepwalk into causing him harm.
20 years of marriage and I have never given my husband cause for concern. So far, so ... it's working. I'll take that over being one of the people I have seen sitting in a heap crying that they didn't mean it and it "just" happened.
Because it didn't "just" happen. There are pretty much always clear stages where walk away and avoidance was possible and doable, but they didn't. Some of them had a theory about themselves that didn't pan out as well in practice. There's a very hollow victory to be had in calling them non-decent, considering the ripple effect of pain and loss for so many people.