Sam's arrogant boyfriend Greg insists sex between two girls isn't really sex, merely foreplay. Sam's best friend disagrees. When Greg issues her with a challenge, she accepts, but the straight-laced Sam is reluctant to play. When Greg's insults tip her over the edge, she decides to let her friend prove him wrong. But Greg is unable to refrain from getting involved, irritating the two girls and threatening the impromptu lesbian adventure. If the pair can somehow get rid of Greg, they can relax and have some fun. But how?