Consenting Adults is a 1992 American mystery crimethriller film directed by Alan J. Pakula, and stars Kevin Kline, Mary Elizabeth Mastrantonio, Kevin Spacey and Rebecca Miller. The original music score was composed by Michael Small. The films tagline is Thou shalt not covet thy neighbors wife. This film has been remade in Bollywood as Ajnabee.
The plot takes a nasty turn when Richard does sleep with Kay supposedly without her realizing that he is not her husband and Kay turns up bludgeoned to death with a baseball bat the next morning. Later it is revealed that Eddy spent the night elsewhere, to establish an airtight alibi. Richards fingerprints are on the bat the two couples having played a friendly game of softball earlier that day and his semen is found in her body, so he is charged with the crime. Insult is added to injury as Priscilla disowns and divorces Richard due to his infidelity. Eddy soon becomes Priscillas lover and a substitute father to Richards child.A distraught Richard finally finds a ray of hope when he discovers that Kay is alive, recognizing her voice singing in a radio talent show. With the help of a private investigator hired by the insurance company from which Eddy is attempting to collect a 1.5 million indemnity claim, Richard tracks her down and learns the truth of how he was betrayed. Kay is guiltridden over her part in it, but terrified at Eddys threat to implicate her if she testifies. Eddy, anticipating what Richard intends to do next, murders Kay and slips away. Implicated in a second murder, Richard must now flee the scene as police sirens approach. ........
Source: Wikipedia