I've never been mistaken for a Commie, before! LOL
But, this pretty much represents the root of our "disagreement." On principle, I agree with your original premise, about mutually exclusive LTRs growing stale. However, if I said that the M107 was the best sniper rifle...because of its rapid rate of fire, you may or may not agree the first part of that statement, but you're bound to disagree with the second part, even though most readers wouldn't have an opinion. Basically agreeing on the premise doesn't demand agreement with the supporting rationale.
I thought it was important, given your focus on the female's declining desire, and given that the focus of this forum is creating female desire, to explain A primary cause of declining female desire for a male she(presumably)selected for an exclusive mating relationship, intended to occupy(at minumum)the remainder of her fertile years.
I realize we live in an age of popularized femarxism, when we're intended to believe that human nature has done a 180° since our primitive ancestors, and that Leftist luminaries can levitate themselves through the air, like soap bubbles, and suspend the laws of nature, just by repeating "2+2=5" while rhythmically clicking their heels, buuuut...fertile women still NEEEEED to be pregnant. I know. It came as a shock to me, too, at one time. I mean, find one who'll say it out loud....in public! Right? However, what man over 18 is foolish enough to accept a woman's denials as evidence of anything? You're gonna hafta trust me.
There's almost never just one factor responsible for anything, but if I could caution young men about only one thing, it would be to avoid marriage, like the plague, until YOU are prepared to "fill your quiver." If you are taking that pretty little thing off the market for exclusive copulation rights, not exclusive reproductive rights, you aren't ready to get married. If you keep that womb empty, during her fertile years, she will eventually repay you with resentment. If all you want is a steady supply of pu55y, it would be wiser and cheaper to just keep rotating through short-term sexual encounters....until YOU are ready to start breeding your own army.
You can agree or disagree, but pregnant women rarely file for divorce. When you decide you already have enough dependents, and start withholding your seed, you will begin to notice the change...unless you aren't paying attention, which is a different problem.
A book could be written on this topic, alone, and some will complain that i already did. So, I'll leave it there, unless anyone wants to debate or discuss this further.