Uh huh. Within four years, mostly. That is how long the chemical frisson takes to wear off (and coincidentally, how long it is to fully wean a child) and then the hot sex goes and so does the marriage.

I had SO many girlfriends that I saw go through this EXACT pattern. Here I was the last one married, watching them all get hitched (thinking there was something wrong with me) and then came the kids and then the divorces and then remarried and a few hitting a second divorce. I'm like WTF, I got tight with my best friend first, then we became lovers and finally got hitched 7 years after we met. 35 years later, he is still my best friend first and foremost. He kicks my ass and keeps me on my toes. Drives me up a wall and I love it.

It's about finding someone you do NOT have to fuck 24/7 that you like so much, that once the sex goes (and it does, if we're being honestly blunt about it) you still are crazy about them, and they are about you.