When Clover and her friends stumble upon an isolated settlement in the wilderness, they learn about an unusual custom practiced by the denizens. Whenever a member of the community turns eighteen, they must pleasure themselves in full view of the tribe in a specially built amphitheater in the village square.
Invited to view the spectacle for themselves, the friends take a seat next to the rest of the naked viewers. Although the main purpose of the ritual is to allay young people's nervousness about performing sex for the first time, it has the additional benefit of expanding everyone's knowledge about the various methods of stimulating themselves.
As each novice takes the stage and begins to arouse themselves in ever more innovative ways, the friends' eyes are opened to a whole new world of kinky and erotic wonders. With the performers alternating one at a time between boy and girl, they become increasingly turned on while the rest of the crowd stimulates themselves in kind.
Each day, another group of young people take the stage and demonstrate exciting new ways of pleasuring themselves until the next full moon, when the winners of the best performance hookup for a special couples demonstration that takes auto-eroticism to an entirely new level...