It's 10,000 BC and an all female tribe is out hunting for food. They see a figure approaching and jump him from behind, hitting him with their clubs until he is unconscious. But as they examine their catch they are shocked to see a "snake" between his legs. They have never seen a man before and are confused. They look between their own legs but can't find such a snake and they wonder what it is. As they tentatively touch and prod at his cock, it twitches and the girls become even more curious. One of them wraps her hand round it and although he is still groggy, the caveman's basic instincts are to start thrusting. As he fucks her hand she understands and starts stroking it herself, amazing the other girls as his "bone" starts to grow bigger and bigger. One by one each of the cave women want a turn to play with the "magic stick", measuring it against the bones they are carrying as weapons.