Trisha Harden is used to staying in the background, unseen by everyone. The only person who ever noticed her was her now-best-friend, Kelsey Liverwood. Now that their senior year of high school is coming to an end, Kelsey decides to tell Trisha about her "Sex Circle." Apparently, Kelsey is juggling four guys at the same time. And every Saturday, she meets one of them and has... well, sex. Trisha can't believe it when she tells her, but is soon dragged into it when one of Kelsey's "boy-toys," Damon, catches her attention. For some reason Trisha feels an attraction toward him, and he begins to show her a different kind of life. Suddenly, she isn't simply in the background anymore. But when things intensify, the threat of Kelsey finding out about their relationship looms high above them. They want each other and the special moments they sure. But Damon can't bring himself to hurt Kelsey. And when the time comes for him to choose, it'll leave you hanging on the edge of your seats.