"I know this is a hot take, and I think there are plenty of people who are truly loyal, very unwilling to ever have an affair, and never will. I know those people exist, but I think pretty much anyone is capable given the right (wrong?) conditions and the right set of circumstances."
@Pogre , what made you come to this conclusion, out of curiousity?
In my lifetime and relationships I've been in, I've wondered if there are women out there who are truly loyal till the end.
I've been told various times that biologically, they can't be this way. It's just not in their nature, via hardwired biology (survival of the fittest, choosing the strongest mate, etc.)
I think a girl that I was with, whom I was her first and only sexual partner, and she was very hardheaded and stubborn, and Christian... I think she was actually truly loyal, and would stay that way. If you believe in astrology, she was a Taurus, and I read that Taurus's are the most loyal sign (Take that as you may - just repeating what I read).
She was a great girl, I really like her and wish her the best, but we would end up just arguing most of the time, and although we loved each other, it didn't work out for that reason. But if it had, I feel she was one of the ones who would have been loyal forever.
(I hear people change every 7 years, as every cell in our body gets regenerated every 7 years. Another questionable theory I heard, but if true, maybe the above wouldn't have mattered in the end).
Sorry if ranting - just putting in my 2 cents.