Martha and Sergio are a married couple whose sex is not going well. To fix Sergio asks a friend to organize an orgy to take his wife and observe if she loses her inhibitions. It carries out the plan and all is well until one of the guests want to force Martha to sleep with him. To be despised by her and see her husband supports her, decides to take revenge. Aided by others retain rape Marta and despite the resistance of it. At the end, discovers that like being raped and is masochistic