At the request of a man with a cuckold fetish, the wife is invited out under the pretense of filming a "private adult video" to record the couple's sex. However, when filming begins, the husband does not get an erection... So the couple introduces another man who has been prepared as a substitute for the husband. The wife accepts the man who is to stand in for her husband who cannot get an erection under the conditions that "no deep kissing," "no blow jobs," and "pretending to have sex," but...