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''Les Liaisons dangereuses'' is an 18th century EpistolaryNovel by French author Pierre Choderlos de Laclos.

It was adapted as a stage play in 1985, with its French name, then as a film in 1988, named ''Dangerous Liaisons'', then the very next year as ''Valmont'', and updated in 1999 [[HighSchoolAU to a modern high school]] as ''Film/CruelIntentions''. In 2003, another modern-dress (late 1950's/early 1960's) adaptation was filmed as a miniseries for French TV, starring Catherine Deneuve and Creator/LeeleeSobieski.

The story follows wealthy aristocrats engaged in a malicious bet involving sexual conquests, revenge, manipulation, seduction, and love in the sophisticated, and decadent atmosphere of 18th century French high society.
!!Tropes used in ''Dangerous Liaisons'':

* AlliterativeName: The main characters are:
** Vicomte de Valmont
** The Marquise de Merteuil.
* AllWomenArePrudes: Zig-zagged- it's implied that all the "virtuous" women are at best indifferent, but Tourvel is something of a grey area.
* {{Ambiguously Bi}}: Cecile and Merteuil have shades of this, thanks to undertones put by the author in some Letters such as the 20th and 63rd.
* ArrangedMarriage: Cecile's mother has one planned for her.
* TheBet: The lynch pin of the plot. Valmont and Merteuil hatch a bet that he will be able to seduce Tourvel; if he wins (with written proof) Merteuil will spend the night with him.
* BitchInSheepsClothing: Merteuil. At one point in the play when she's comforting Cecile and has her arms around her, the stage direction describes her as looking "bored and impatient".
* BreakTheHaughty: [[spoiler:Merteuil in the end. Valmont ensures from beyond the grave that her reputation is utterly wrecked, causing her to have to leave Paris in disgrace, and in the book she also contracts smallpox, destroying her beauty.]]
* ByronicHero: Tourvel and Volanges certainly consider Valmont to be this
%%* ConvenientMiscarriage: [[spoiler: Cecile's.]]
%%* CorruptTheCutie: Cecile.
%%* CostumePorn
* DeathByDespair: [[spoiler: Tourvel, already wretched from Valmont's rejection, goes into a downward spiral when she hears of his death.]]
* DeathEqualsRedemption: It's only [[spoiler: as he's dying that Valmont does something good.]]
* DoubleStandard: The novel makes much of the inherent unfairness in the way women's and men's reputations are affected by sexual rumors.
* DownerEnding: [[spoiler: Valmont and de Tourvel are dead, Cecile's so broken by all the manipulation she decides to become a nun, and Merteuil is (in the film and book) publicly disgraced and (also in the book) facially disfigured from smallpox. She's gotten so engaging, if not actually likeable, that it can be hard to witness her downfall. In the play she gets off practically scot-free but is emotionally broken by the idea that Valmont loved someone other than her, and of course -- as the threatening shadow of the guillotine on the wall at the very ends reminds us -- the French Revolution is on the way...]]
%%* DuelOfSeduction
* DuelToTheDeath: [[spoiler:Between Valmont and Danceny, which Valmont loses]].
* EpistolaryNovel: Though the film has the characters meeting and discussing things they write in the book, it still retains a lot of letter writing. Often with original substitutes for a desk.
* ExactWords: Valmont is very fond of those, finding pleasure and amusement in his own duplicity, like when he tells Tourvel she "would think less of him if she knew his motives." Taken UpToEleven in his best letter, written in bed, on another lover's bare back, and composed in its entirety of sentences alluding to that fact.
* IncorruptiblePurePureness: Merteuil fakes this extremely well, pretty much out of necessity. (Keeping up a not just good but absolutely unassailable reputation is the only way to ensure that anyone spreading rumors about what she's ''really'' up to won't be believed.)
* IdleRich: Virtually all of the cast. Valmont is astonished at the seemingly paltry of money he pays to save a poor family from ruin (to look good in Tourvel's eyes, naturally) and that such families are not uncommon.
%%* TheIngenue: Cecile. So very much.
* IronicEcho: After succeeding in [[spoiler: sleeping with Madame de Tourvel]], Valmont says that his infatuation with her is temporarily "beyond his control." This is the same phrase Merteuil uses when telling her IHaveThisFriend story, which ultimately leads to [[spoiler: his dumping Tourvel and his doom]].
* LiteraryAgentHypothesis: Laclos uses the framing device that he discovered the journals and is publishing them, and comments on how MoralGuardians likely object but he is publishing them for a moral purpose (namely that people like Valmont and Merteuil are [[DoNotDoThisCoolThing bad and others should avoid being taken in by someone like them]])
* LadykillerInLove: Valmont, though he is so jaded he doesn't notice he is in love until it's pointed out to him.
* LipstickAndLoadMontage: The opening credits to the film has a montage featuring both the main male and female characters. It looks like they are dressing for battle, and [[UsefulNotes/TheRenaissance they were]].
* ManipulativeBastard: Valmont but especially Merteuil, the TropeCodifier for ManipulativeBitch. A proto-feminist letter argues that there was no other way for a woman to get ahead and live the life she wanted in the 18th century. In ''Cruel Intentions'', Kathryn argues that she cannot enjoy sex and be considered 'nice' and that this double standard drives ''her'' manipulations. However, this argument is much [[FreudianExcuse weaker]] in ''Cruel Intentions''.
* TheMasochismTango: Valmont and Merteuil [[spoiler: take this to its logical extreme with Valmont's death as a direct result of Merteuil's manipulation of Danceny, shortly followed by Merteuil's humiliation by ''Valmont's'' manipulation of Danceny.]]
* MyEyesAreUpHere: In one of the first scenes of the movie, when Valmont meets Cecile. Whenever he isn't talking, he's very openly staring at Cecile's chest. Needless to say, it makes her mother uncomfortable.
* NatureAdoresAVirgin: Played straight with Madame do Tourvel, inverted with Cecile.
%%* NotHimself
* NotIfTheyEnjoyedItRationalization: Used by Merteul on Cecile with extreme cruelty when the despairing girl writes to her for help ; earlier, the marquise writes to Valmont claiming that women ''welcome'' sexual violence, as it gives them an excuse in a world where they can't freely succumb to desire.
* ThePornomancer: Averted; the characters spend quite a lot of time on the planning and implementation of a seduction.
* PrivateTutor: Danceny teaches music to Cecile.
%%* TheQueensLatin
* SettingUpdate: Besides ''Film/CruelIntentions'', one miniseries set the story in 1960s France and the South Korean film ''Untold Scandal'' transplants the story from 18th Century France to 18th Century Korea. A Chinese adaptation released in 2012 sets the story in 1930s Shanghai.
* SleepingTheirWayToTheTop: Valmont reminiscences about the time he had an affair with a well-connected noblewoman in exchange for her pulling strings to advance his career. He despised her ([[DeadpanSnarker he mentions that he was tempted to tell her "Madam, I'll forget about the position I'm seeking if you'll let me leave the one I now occupy"]]) and took immense pleasure in [[JerkAss trashing her reputation the minute she was no longer useful to him.]]
%%* SlidingScaleOfShinyVersusGritty
%%* SnowMeansDeath
* StepfordSmiler: Catherine/de Merteuil is very much type C. She invested a great deal of hard work to become so.
%%* ThisMeansWar
%%* TitleDrop
%%* UnholyMatrimony: Valmont and Merteuil
%%* TheVamp: Merteuil when around Valmont.
* VillainousBreakdown: [[spoiler: When Merteuil learns of Valmont's death.]]
%%* {{Villain Protagonist}}s
%%* VirginityMakesYouStupid
%%* WhiteShirtOfDeath