When a group of naive teens working at a movie theater in a small Christian town discover a mysterious film hidden in its basement, they unleash an alluring succubus who gives them a sex education…written in blood.
After returning to Los Angeles from a group therapy session, documentary filmmaker Bob Sanders and his wife, Carol, find themselves becoming vigilante couples counselors, offering unsolicited advice to their best friends, Ted and Alice Henderson. Not wanting to be rude, the Hendersons play along, but some latent sexual tension among the four soon comes bubbling to the surface, and long-buried desires don't stay buried for long.
Day in and day out, lovers Cynthia and Evelyn enact an elaborate sadomasochistic fantasy as mistress and maid. But as their ritual of domination and submission begins to turn stale, Cynthia yearns for something more conventional, while Evelyn tries to push their taboos even further.