I have an entirely different theory. When Og first got the cave, Oggette wanted to move in. After all, Og was a pretty good provider, hunted well, and had a decent hole in the wall. Well, one day when Og was out chasing Mammoth, Oggette snuck into the cave, cleaned out the old bones and such, stashed his stuff neatly, and painted the walls with a few critters and such to brighten the place up.
When Og came back, naturally, he was enraged that his stuff had been messed with in his absence, and gave Oggette the boot.
But then, he realized he couldn't find his favorite scraper.
Dangit, where was his stash of berries?
So, Og relented and let Oggette back in in exchange for keeping the place clean and finding all his stuff she had squirrelled away.
Thus were born domestic arrangements.
One thing led to another, and little Ogs and Oggettes were swarming the place before long. When they got big enough to re-arrange the cave, Oggette made them get a cave of their own.
Oggette continued to stash Og's stuff relentlessly, especially if he looked like he might want to share the hides with the younger oggette a few caves down, and so the arrangement continued.
Shortly after that, one of the tribe who didn't want to hunt those big, nasty mammoth decided he could paint caves, too, and that is where interior decorators came from, (but that is another story...)
What's worse is that occasionally Oggette would feel the need to rearrange the boulders in the cave. The responsibility of moving the boulders fell on Og when he would get home after a long day of chasing Mammoth.
Og would of course oblige. Now once the boulders were moved, all the cave paintings would be out of place messing up the Che of the room (Che was pronounced "Grunt" back then...as was everything else).
Now the "interior decorator" would have to be called back in to move the paintings. Some enterprising cavemen would actually just carve the paintings out of the wall and move them rather than deal with the decorator (hence the invention of quarrying).
Now to top it all off lil Oggette started dating some Neanderthal. Og was so concerned over this that he cut her hair short to defend her honor.
Tough times back then.