Compulsion (2008)
2008A rich man’s daughter, who loves her penniless boyfriend, has sex with the family chauffeur in exchange for a favor involving the guy whom her father arranged for her to marry,
Actors: Ray Winstone
The Sweeney (2012)
2012Jack Regan is a slobbish, old-style cop whose unsubtle methods usually get results, to the annoyance of internal affairs officer Lewis, who would be even more annoyed if he knew that Regan was having an affair with his young wife, policewoman Nancy.
Quadrophenia (1979)
1979A chick has a boyfriend but she still flirts with another guy every time they come across each other and eventually makes out with him and then has sex with him in an alley while a riot is going on.
The Departed
2006To take down South Boston’s Irish Mafia, the police send in one of their own to infiltrate the underworld, not realizing the syndicate has done likewise. While an undercover cop curries favor with the mob kingpin, a career criminal rises through the police ranks. But both sides soon discover there’s a mole among them.