Where does "dump body" fit into the list?
Seriously though, that's pretty much the way it goes until you find someone that can make number six read "once the excitement is gone, you settle in and learn to enjoy little things together and/or apart."
I thought I had that once, but she wanted "excitement". Funny though, I can always tell when "Mr. Excitement" is out of town because the ex gets really chatty. Obviously, the art of conversation is lost on "Mr. Excitement".
As old fashioned as this sounds, I think sex too early in a relationship dooms it to failure. Too often, physical "intimacy" is substituted for true intimacy. When the sex loses its initial spark, there's nowhere for the relationship to go but down.