It's not that surprising to think of exes getting back together just long enough to have sex, when you think about it. At some point, they were attracted to each other. Then, something in their situation separated them until they couldn't stand to be married anymore. But chances are, the problems that drove them apart were all part of their married life together--the kids, the mortgage, the responsibilities. When they've been divorced for awhile, those real-world details are gone and they're back to being two people with no binding commitment who find each other attractive. It's a little like having an affair with your own spouse, actually.
I kind of figured the appeal to French culture was sort of a throwaway thing . . . . in these threads, especially when two or three people are working on you at once, it's easy to get bogged down in argument/counter-argument. But it leads us down little diversion paths which are entertaining but not really addressing the reason we come here. I'm glad you stepped back and made a stop-here-and-summarize kind of post; we can all take a breath and start over for a minute.
But my last question still stands--what do you want? What is your goal?