Ava, Penelope, David, and Tyler, are a quartet of young devout Jesus lovers. When they find out their church has a chastity club, the boys are very excited by the prospect. But Ava and Penelope are a little more curious about sex and aren’t sure about chastity just yet. Ava and Penelope steal a sex positions book from their parents and run to their room to peak through the pages. When David and Tyler catch their stepsisters reading the smut, the boys take it upon themselves to teach the girls a valuable lesson.