While I agree, obviously, there's a fucking little detail that fucks us all, time after time after time...
We males are fucking visual oriented.
By this I mean, Sharon (made up name) may be a saint and the best possible life partner ever, but, Eliane (made up name) is a bombshell that walks by and does everything she can to seduce you... you're in a fucking bind.
It will come down to if you are capable to resist temptations or not. Don't even try to answer if you haven't been REALLY, REALLY tempted. I have to confess, I wasn't strong enough. Fuck, I was 30, and I had NEVER been in such a situation that a fucking goddess was creaming her pants for me. I swear it was akin to temporary insanity. After a couple weeks I ended it, the spell was over. My then girlfriend, now wife, hasn't got over it in 30 years. We kept together, but, it's been hard, very hard.
So, no, mate, while I do agree that personality is absolutely the standard, we are fucking primates with a little veneer of civilization sprayed over, and we'll IN MOST CASES fail to resist. Some do. I envy them. But most fail. Or, the temptress wasn't really serious about it. Mine was.
Peace