Two great turning points in civilization highlight this tale of sexy cavewomen vs. dopey cavemen.
One: The discovery of fire.
Two: The invention of the little thigh-baring mini-dress. 
In the pre-miniskirt year of 1950 the ultra-low budget Prehistoric Women surely held adolescent boys in rapt attention with its cast of women who spend the entire movie running around in short little cavegirl outfits. And in color no less.
The plot is equally skimpy. A bunch of girls in the dinosaur age whose mothers ran away from their domineering men years ago are now all grown up and don’t know much about men other than that they don’t like ’em. When they run into some guys out in the wilderness, they surprise attack them and win, proceeding to tie them up, beat them, and keep them as slaves. Eventually the men discover fire and they use it to turn the tables on the ladies. It’s a moving story of struggle and redemption. And catfights. And S&M fetishes.
No real dialogue is spoken by the actors here, of course. It’s all gibberish primitive-speak. A narrator guides us through the story.