LOL! Good theory. :)
Think about it.
Who would have the most time on their hands to do cave painting (decoration)?
Who would have the time to find ochre and charcoal and other color paints and make brushes?
Unless they were done by gay cave men interior decorators, the cave women would have been the only ones to do this.
I cannot believe that cave men sat around deciding what color to use on the next rock wall.....................