Sam Farragut is a sociopathic business executive in Southern California who forces a team of advertising agency employees to embark on a dangerous dirtbike trip to the Baja California desert in order to compete for his business .  The men are Warren Summerfield , a suicidal middle-aged ad executive who has been fired from the agency ; the straightlaced Paul McIlvain who is inattentive to his wife , and brash art designer Maxon who feels suddenly trapped after his girlfriend announces she is pregnant .  There are numerous long sequences of motorcycle riding on desert backroads .  Summerfield has been having an affair with McIlvian's wife .  He has not told his wife that he was fired and is simply serving out his tenure at the agency while looking for a new position .  His wife is actually aware of the affair .  Farragut convinces the ad men to make the motorcycle journey on the pretext of looking for a location to shoot a commercial .  In reality , Farragut is reckless and looking to involve the men in spontaneous edgy adventure of his own manipulation .  After they leave , McIlvain's wife suspects that Summerfield is planning to kill himself for the insurance money , but she can not convince Summerfield's wife to instigate a search .  The four men travel deeper into Mexico on isolated dirt roads .  At one point Summerfield contemplates plunging off a cliff .  After being humiliated by a young American couple in a Baja bar , Farragut tracks them down on the beach while accompanied by Maxon . 
Who is Summerfield having an affair with and does his wife know that he is having an affair?
Summerfield is having an affair with McIIvian's wife and he has not told his wife but she is aware of the affair