History BrotherSisterIncest / LiveActionFilms

* ''{{Film/Consent}}'': A dysfunctional family is plagued with grief after the suicide of the eldest daughter. The parents go about relieving their grief in all the wrong ways, mostly by disconnecting from their own feelings, and ultimately, their own children. The younger sister Amanda looks for love in all the wrong places. Her emotional handicap creates a particularly awkward situation for her older brother Josh, who finds himself on the receiving end of his sister's misguided search for love. Josh, being the older brother, knows his sister's love for him is misguided and at one point rejects her advance, which upsets her. [[http://www.imdb.com/title/tt1090749/ IMDB link]]

* ''{{Film/Zathura}}'': [[spoiler:Lisa develops a crush on the hunky astronaut, who [[SurpriseIncest turns out]] to be an older version of one of her brothers. Once she learns this, she is, understandably, squicked out.]]

* ''Film/AtorTheFightingEagle'': Ator, the titular swordsman, falls in love with a woman whom he thinks is his blood sister; when he asks their father permission to marry her, the father happily reveals that he is in fact, adopted. (Instead of, you know, being totally squicked out by the idea that he would be in love with his blood sister in the first place).

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%% All examples are sorted out in alphabetical order. Please add new examples in alphabetical order.

** In ''Film/CruelIntentions2'', a pair of girls (who claim to be KissingCousins, but are played by real-life {{twin|cest}}s share a kiss in the shower while the [[YuriFan male lead watches]].

%%* ''Film/AngelsAndInsects'': This is a plot point in the film

** In ''Film/CruelIntentions2'', a pair of girls (who claim to be KissingCousins, but are played by real-life [[{{Twincest}} twins}}]] share a kiss in the shower while the [[YuriFan male lead watches]].

* ''{{Film/Deadfall}}'': Although whether or not they actually had engaged in incestuous relations in the past is purposefully kept vague (according to the actors and producers), the mutual sexual attraction between criminal siblings played by Eric Bana and Olivia Wilde is most definitely intentional and in fact drives a lot of the plot.

* ''Film/NotAnotherTeenMovie'': When they parody ''Film/CruelIntentions'', whose protagonists are FlirtyStepsiblings, a brother objects to sex with his sister, who points out that they're only related [[spoiler:by blood]].

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%% * ''Film/AugustUndergroundsMordum'': Crusty and Maggot are introduced having rough sex with each other.

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%% * ''Film/BrotherhoodOfTheWolf'': [[spoiler:Jean-François towards Marianne. It's never quite clear what exactly happens outside of his mind, but he looks quite psychotic and certainly ''wants'' her. And he ends up raping her.]]

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%%* ''Film/TheDreamers'':

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* In ''Film/EnterTheVoid'', incest between Oscar and his sister is heavily implied.

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* ''Film/TheFallOfTheHouseOfUsher'': In the 2006 adaptation of Poe's ''Literature/TheFallOfTheHouseOfUsher'', incest was a family tradition that already ran over 5 or 6 generations.

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%%* ''Literature/TheHotelNewHampshire'' uses it for comedy, drama, {{Squick}} and romance... somehow it works.

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* ''Film/NotAnotherTeenMovie'': When they parody ''Film/CruelIntentions'', a brother objects to sex with his sister, who points out that they're only related [[spoiler:by blood]].
-->'''Jake''': That's disgusting. You're my sister!\\
'''Catherine''': Only by blood!

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%% * ''{{Flm/Slasher}}'': Julie and Mike

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%%* ''Film/ThisWorldThenTheFireworks'': A 1997 film noir with Billy Zane and Creator/GinaGershon as twins.

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%%* ''Film/TheWoodsman'': Backstory for the protagonist's love interest

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* ''{{Film/Scaramouche}}'': Andre briefly flirts with Aline de Gavrillac but backs off when evidence leads him to believe that she is his sister, and turns his attentions to Lenore. In the end, Lenore gives Andre proof that [[CleaningUpRomanticLooseEnds he and Aline aren't related,]] [[IWantMyBelovedToBeHappy and steps aside so Andre can marry Aline.]]

* ''{{Film/Atonement}}'': The actor playing Leon, Cecilia and Briony's brother, [[WordOfGod believed]] that Leon and Cecilia's relationship had elements of incest; director Wright commented that [[FlipFlopOfGod he wasn't sure]] he agreed with him on that, and speculated it may have been because so many of Ian McEwan's other novels have incest in them. Nonetheless there are a few moments in the film (and another in a deleted scene) that hint at this idea.

* ''Film/AugustUndergroundsMordum'': Crusty and Maggot are introduced having rough sex with each other.

* The twist in the Australian film ''Film/BeautifulKate'' is that Kate had sex with her twin brother Ned and older brother Cliff. Cliff then killed her in a car crash and committed suicide out of shame.

* ''Film/BrotherhoodOfTheWolf'': [[spoiler:Jean-François towards Marianne. It's never quite clear what exactly happens outside of his mind, but he looks quite psychotic and certainly ''wants'' her. And he ends up raping her.]]

* ''Series/ChildrenOfDune'': There are strong incestuous overtones between Leto II and his twin sister Ghanima. It's never outright confirmed but they do share many tender moments together, even kissing on the mouth when reunited in the end.

* ''Film/EuroTrip'': Twins Jenny and Jamie chug down absinthe at a nightclub, become immensely pissed, and start making out with the first person in their reach...realizing far, far too late that they're actually making out with each other. HilarityEnsues.
-->Worst. Twins. Ever.

* ''Film/TheHouseOfYes'': The twins blatantly admit to their incestuous behavior, much to their younger siblings' disgust.

* ''Film/LoveSick'': In this Romanian movie (''Film/LegaturiBolnavicioase''), there is a college girl who sleeps with her brother and is in love with her best friend. [[LesYay Who is also a girl]].

* ''Film/MyChauffeur'': In this otherwise forgettable film, the male and female lead characters hump like bunnies. The next day they find out they might be brother and sister. HilarityEnsues.

* In ''Film/NationalLampoonsClassReunion'', what turned antagonist Walter Baylor into a crazy az murderer was a prank where he was set up to have a makeout session with what turned out to be his own twin sister.

* ''{{Flm/Slasher}}'': Julie and Mike

* The deformed cannibal twins in ''Film/WrongTurn2DeadEnd''. In one instance, the girl gets jealous and violent when she discovers her brother masturbating to the sight of a sunbathing woman. She kills the woman, and the two start to have sex afterwards.

* ''Film/BladesOfGlory'': villains Stranz and Fairchild Van Waldenberg fairly smolder with sexual tension for one another until they finally fling themselves at each other just as the police are hauling them away. It's OK, though - the actors are married in RealLife.

* In the ''Film/AlvinAndTheChipmunks'' films, Beatrice Miller is AdaptedOut and replaced with Dave as the Chipettes' adopted parent. This makes them the adopted sisters of Alvin, Simon, and Theodore. The romance between the characters still exists.

** In ''Cruel Intentions 2'', a pair of girls (who claim to be KissingCousins, but are played by real-life [[{{Twincest}} twins}}]] share a kiss in the shower while the [[YuriFan male lead watches]].

* ''Film/TheRockyHorrorPictureShow'':
** Riff-Raff and Magenta certainly seem to have a closer relationship than most siblings (just look at a certain phrase above...).
** The same actors, Creator/RichardOBrian and Creator/PatriciaQuinn, play different characters (Drs. Cosmo and Nation [=McKinley=]) in the sort-of sequel, ''Film/ShockTreatment'' Cosmo and Nation have a much more explicitly BSI relationship. [[spoiler: Until it's discovered that they're not actually siblings, but character actors with a bad habit of letting their real relationship bleed into their roles.]]

* John Sayles' ''Lone Star'': [[spoiler: after they've begun a new relationship, the main character and his love interest find out the reason why his much hated father kept them apart while they were teen was because they were half-brother and sister. Since she is sterile, they decide to move somewhere their biological connection won't be known and go on with the relationship]].
* In the 1988 remake of ''D.O.A'' it is revealed that [[spoiler:the murder victim and his long-term girlfriend were brother and sister. Neither of them knew it.]]
* Richie and Margot's intense desire for one another initiates several important plot elements of ''Film/TheRoyalTenenbaums''. Of course, as Royal would always point out, she's adopted.
* ''This World, Then the Fireworks'' (1997) a film noir with Billy Zane and Creator/GinaGershon as twins.
* Backstory for the protagonist's love interest in ''Film/TheWoodsman''.
* In the 2009 Mexican drama ''Daniel & Ana'', pornographers kidnap two siblings and force them at gunpoint to have sex on camera. Following their release, Ana, now dreading her upcoming marriage, enters therapy, while Daniel becomes consumed with lust for his sister.
* After all the goat screwing, mass murders, and rapes, it turns out the serial killer couple in ''IslandOfDeath'' are brother and sister.
* In ''I Start Counting'', based on a novel by Audrey Erskine Lindop, a girl of 14 is in love with her 32-year-old adopted brother, even when she suspects he's the local sex killer. She makes an advance to him but he refuses.
* In ''Film/ThePeopleUnderTheStairs'', "Mommy and Daddy" (the villains) are eventually revealed to be incestuous brother and sister - and it's a family tradition going back who knows how many generations.
* In ''Sister My Sister,'' the protagonists are sisters who work as live-in maids for the same employer and eventually develop a sexual relationship. Based on a true story, too.
* ''Blood'', a 2004 Canadian movie is all about the dirty talk between sister and her brother, just released from jail. The whole action (nothing explicit) in the movie takes place in a room. But the movie has incestuous overtones.
* ''White Fire'' has an incredibly creepy take on this. The protagonist, Boris, is shown complimenting her sister in inappropriate ways and even takes her towel away from her after she went skinny dipping. When she dies, he meets a prostitute, who reminds Boris very much of his sister. As a result, he falls for her. It doesn't help that the prostitute gets plastic surgery to look exactly like the sister as part of a heist.
* Izzy from ''Film/SickGirl'' initially seems to just idolize her older brother, but as the film progresses it's revealed that she is in love with him, to the point of fantasizing that they are a married couple, and their younger brother is their son.
* Julie and Mike from ''Slasher''.
* The FreudianExcuse of the villain from ''Scrapbook'' is that he was raped by his sister and brother.

* Although whether or not they actually had engaged in incestuous relations in the past is purposefully kept vague (according to the actors and producers), the mutual sexual attraction between criminal siblings played by Eric Bana and Olivia Wilde is most definitely intentional in the movie ''Deadfall'' and in fact drives a lot of the plot.
* In ''Film/ThatsMyBoy'', Donny discovers that his son Han's fiancee is having an affair with her brother. He tells Han, who calls off the wedding.
* An accidental example in ''Film/{{Zathura}}''. Lisa develops a crush on an older version of one of her younger brothers. She doesn't know who he really is until [[spoiler:Walter wishes for his future's self to be reunited with his brother. She's rightfully disgusted by the revelation.]]
* ''Film/ThroughAGlassDarkly'': Minus has a sexual encounter with his sister Karin. It happens because she is mentally ill (schizophrenia) and he is a 17-year-old bag of hormones. He feels bad about it afterwards while her mental breakdown accelerates.
* In ''Film/{{Unconscious}}'', it turns out by the end of the film that [[spoiler: Alma and León are half-siblings, which is why he runs away at the beginning]]. He was adopted, and they married unknowingly.
* ''Film/ShockCorridor'': Johnny fakes desiring and attempting it with his pretend sister to get committed.
* ''[[http://www.imdb.com/title/tt1090749/ Consent]]'': A dysfunctional family is plagued with grief after the suicide of the eldest daughter. The parents go about relieving their grief in all the wrong ways, mostly by disconnecting from their own feelings, and ultimately, their own children. The younger sister Amanda looks for love in all the wrong places. Her emotional handicap creates a particularly awkward situation for her older brother Josh, who finds himself on the receiving end of his sister's misguided search for love. Josh, being the older brother, knows his sister's love for him is misguided and at one point rejects her advance, which upsets her.
* In ''Film/ASimpleFavor'', [[spoiler:Stephanie reveals she has a half-brother that she never knew about until their father died and he turned up at the funeral when they were both young adults. The two sat up and talked all night... and then just slipped into a HeldGaze that wasn't very sibling-like. She then admits to having kissed him, but Emily correctly guesses that they had sex. Possibly more than once -- the two had a relationship that was heated enough that Stephanie's husband figures out that the two are not just siblings. When he asks her, point-blank, who their son's father is, Stephanie's reaction implies she's not sure, herself. We never find out for certain.]]
* In ''Film/TheMansion'', Nadine and Patrice are a couple who proudly proclaim to their friends that they're trying to have together. It's only late in the film that they're revealed to be brother and sister (something they've always been aware of).
* In ''Film/SomethingWicked'' Christine's brother Bill is shown to be attracted to her, watching her getting dressed or having sex with her boyfriend. [[spoiler: She later uses it to her advantage by framing him off her murders, making him look like a CrazyJealousGuy.]]

* A possibly unintentional example, but in ''Film/{{Transformers}}'', according to Sam's [[http://tfwiki.net/w2/images2/c/c7/Witwickytree.jpg family tree]], the Witwicky family tree consists of two generations of inbreeding. This however might just be the fact that Sam did a terrible job researching.

* Played with but ultimately averted in ''Film/{{Scaramouche}}'': Andre briefly flirts with Aline de Gavrillac but backs off when evidence leads him to believe that she is his sister, and turns his attentions to Lenore. In the end, Lenore gives Andre proof that [[CleaningUpRomanticLooseEnds he and Aline aren't related,]] [[IWantMyBelovedToBeHappy and steps aside so Andre can marry Aline.]]

* ''Film/NotAnotherTeenMovie'': When they parody ''Film/CruelIntentions'', a brother objects to sex with his sister, who points out that they're only related [[spoiler:by blood]].
-->'''Jake''': That's disgusting. You're my sister!\\
'''Catherine''': Only by blood!
* A very tragic case in ''Film/TheFaceOfAnother''. A young nurse is exceptionally beautiful but is cursed with a massive scar that covers much of the left side of her face. Starved for human affection, she crawls on top of her brother one night and has sex with him. Then she kills herself the next morning.
* In the Romanian movie called ''Love Sick'' (''Legaturi Bolnavicioase''), there is a college girl who sleeps with her brother and is in love with her best friend. [[LesYay Who is also a girl]].

* ''Film/EuroTrip''. Twins Jenny and Jamie chug down absinthe at a nightclub, become immensely pissed, and start making out with the first person in their reach...realizing far, far too late that they're actually making out with each other. HilarityEnsues.

* ''Innocent Lies'', a British thriller, has this between Celia and Jeremy. They flirt rather openly (including eating melted chocolate off each other) despite Celia being engaged. We later hear her tell a detective all the sordid details of her {{Squick}}y sex life with her brother. [[spoiler: The two even resort to murdering their own mother to keep their relationship a semi-secret.]]
* In ''Film/JoeDirt'', Joe realizes that a woman who is intensely attracted to him may be his long-lost sister, but because he's normally such a loser romantically, he doesn't tell her until ''after'' they have sex. Fortunately, it turns out her brother wasn't ''long''-lost, they found him again almost immediately, meaning she's not related to Joe. This means they can have sex again, but Joe can't get it up anymore - until they role play being brother and sister. In the present day setting of the movie, Joe then admits he made that last part up to gross out his listeners. Or did he?
* ''Film/GingerSnaps'' heavily links lycanthropy with sex; this becomes particularly {{Squick}}y when Ginger suggests Bridgette should let Ginger bite her so they can be their own pack.
* The sequel ''Film/GingerSnapsBackTheBeginning'', which places the characters in the eighteenth century... [[RecycledINSPACE somehow]]... makes this even more explicit, [[spoiler: with Bridgette ultimately choosing to be with Ginger over any other considerations. It's also implied in the film that they had killed their parents to be together...]]

* ''Film/HellboyIITheGoldenArmy'': Prince Nuada seems to have a lot of sexual tension going with his sister Princess Nuala. The presence of implied incest was confirmed [[http://www.superherohype.com/news/featuresnews.php?id=6740 by Nuada's actor]], and in the commentary by the director.
* ''Film/HoldTheDark'': Implied with Medora and Vernon Slone. Medora makes cryptic references to knowing Vernon all her life, to the point that she has no memories without him in them. Later, someone comments on how Vernon and Medora have the same Nordic features. Their strange heritage is one possible reason for their UnholyMatrimony and murderous shared psychosis.
* ''Literature/TheHotelNewHampshire'' uses it for comedy, drama, {{Squick}} and romance... somehow it works.
* ''Film/TheHouseOfYes'': the twins blatantly admit to their incestuous behavior, much to their younger siblings' disgust.
* ''Film/MrNobody'': One of the story lines has Nemo and Anna pursuing a sexual relationship despite being step siblings. Their parents, oblivious to the existing relationship between them, started dating and later got married.
* ''Film/MyChauffeur'': In this otherwise forgettable film, the male and female lead characters hump like bunnies. The next day they find out they might be brother and sister. HilarityEnsues.
* In ''National Lampoon's Class Reunion'', what turned antagonist Walter Baylor into a crazy az murderer was a prank where he was set up to have a makeout session with what turned out to be his own twin sister.
* ''Film/{{Oldboy|2003}}'': In this Korean thriller, it turns out that the reason the protagonist is imprisoned for ten years in a hidden private jail is that [[spoiler: while in school, he told people about seeing the antagonist having sex with a girl who (unbeknownst to the protagonist) was the antagonist's sister. In a further twist, it's revealed that the woman that the protagonist falls in love with after getting out of prison is in fact his own daughter, and that the antagonist arranged his captivity specifically to produce this outcome]].
* ''Film/TheOtherBoleynGirl'': Anne Boleyn miscarries her second child, then asks her brother George to try to impregnate her, though in the end he's incapable of doing the deed.
* In ''Film/{{Paranoiac}}'', Eleanor is tormented by the death of her beloved brother Tony eight years before. When he seemingly returns from death, she is overjoyed, and they spend a lot of time together. Then one night, overcome by her love for him, she kisses him in a very un-sisterly manner. Recognizing how deep her feelings have become sends her into a [[HeroicBSOD mental tailspin]] that nearly drives her to suicide. But the audience already knows that the man is an imposter, so she's not really in love with her own brother (but she ''thought'' she was).
* ''Film/RepoTheGeneticOpera'' has Luigi and Amber Sweet. While all the Largo siblings hate each other, these two have some serious {{UST}} going on. Pavi even comments on it in "Mark It Up".
-->'''Pavi:''' My brother and sister should--\\
'''Luigi:''' Pavi! Shut the FUCK up!
* ''Film/TheRockyHorrorPictureShow'':
** Riff-Raff and Magenta certainly seem to have a closer relationship than most siblings (just look at a certain phrase above...).
** The same actors, Creator/RichardOBrian and Creator/PatriciaQuinn, play different characters (Drs. Cosmo and Nation [=McKinley=]) in the sort-of sequel, ''Film/ShockTreatment'' Cosmo and Nation have a much more explicitly BSI relationship. [[spoiler: Until it's discovered that they're not actually siblings, but character actors with a bad habit of letting their real relationship bleed into their roles.]]
* ''Film/SayItIsntSo'' uses this as a joke for almost the whole film. Jo (Heather Graham) and Gilbert (Chris Klein) fall in love. Jo's parents aren't too happy that she isn't dating a rich guy, so they come up with a plan to convince her and Gilbert that they're brother and sister, so that they can become rich. Gilbert realizes they're not related when Jo's REAL brother shows up, then HilarityEnsues when Gilbert repeatedly goes to great lengths to convince Jo that they aren't related. After they get married, a [[BrickJoke brick falls out of the sky]], in the shape of Susanne Sommers, who turns out is Gilbert's real mother. Gilbert is so happy, until Jo reminds him of what he told her earlier... [[spoiler:using posters of said celebrity as masturbation fodder]] in his teen years.
* ''Film/Scarface1983'': Tony Montana's violent protectiveness toward his sister Gina has definite elements of this, inspired by [[Film/Scarface1932 the 1932 film]] it was a remake of, which had its title character carrying on the same kind of relationship with his own sister. This, combined with the effects of his increasing cocaine addiction, culminates in Tony gunning down his best friend Manny after catching him with her (and after she and Manny had gotten ''married'', no less). Gina confronts Tony near the end about it as his mansion is being besieged by Sosa's killers and tries to kill him, but Sosa's men get her before she can reach him. This, among other things, is what finally drives Tony to take up his M-16 and go out with guns blazing.
* ''[[Film/TheBradyBunch A Very Brady Sequel]]'': Averted (barely) when Greg and Marcia bravely fight an attraction inspired by the real-life sexual tension between Maureen [=McCormick=] and Barry Williams in the original show. Of course, Greg and Marcia aren't blood relations. Theirs is a blended family, formed when Mike, father of three boys, married Carol, mother of three girls. This factors into the situation in the film, since the legality of Mike and Carol's marriage is contested.
* In ''Film/TheSeeker'', there is a distinctly unsisterly vibe towards Will from the youngest sister.
* In the adaptation of ''Film/FlowersInTheAttic'', they removed much of this trope when it came to Christopher and Cathy, but not completely. They are obviously very very close, are awfully comfortable getting naked around each other, and at one point he washes her back for her while she was in the bath. WordOfGod is that the incest was originally included, but cut due to negative reactions from test audiences.
* John Sayles' ''Lone Star'': [[spoiler: after they've begun a new relationship, the main character and his love interest find out the reason why his much hated father kept them apart while they were teen was because they were half-brother and sister. Since she is sterile, they decide to move somewhere their biological connection won't be known and go on with the relationship]].
* In the 1988 remake of ''D.O.A'' it is revealed that [[spoiler:the murder victim and his long-term girlfriend were brother and sister. Neither of them knew it.]]
* ''Film/TheFallOfTheHouseOfUsher'': In the 2006 Poe adaptation of ''Literature/TheFallOfTheHouseOfUsher'', incest was a family tradition that already ran over 5 or 6 generations.

* ''Film/TromeoAndJuliet'':
** The titular lovers find out they're really brother and sister, but decide "Fuck it", and continue their relationship anyway.
** At the beginning of the movie, Sammy, one of Juliet's cousins, hits on his sister Georgie and the genetic ramifications of this trope is discussed. [[spoiler: Which, as [[WebVideo/BrowsHeldHigh Oancitizen]] pointed out, foreshadows the ending.]]
* One of the main plot elements of ''The Dreamers''.
* In ''Film/EnterTheVoid'', incest between Oscar and his sister is heavily implied.
* Richie and Margot's intense desire for one another initiates several important plot elements of ''Film/TheRoyalTenenbaums''. Of course, as Royal would always point out, she's adopted.
* ''This World, Then the Fireworks'' (1997) a film noir with Billy Zane and Creator/GinaGershon as twins.
* In ''Film/HaroldAndKumarEscapeFromGuantanamoBay'', the titular duo encounter an UglyGuyHotWife couple in Alabama who are brother and sister. Their son has several horrible genetic defects, the most obvious is the fact that he's a cyclops.
* Backstory for the protagonist's love interest in ''Film/TheWoodsman''.
* In the 2009 Mexican drama ''Daniel & Ana'', pornographers kidnap two siblings and force them at gunpoint to have sex on camera. Following their release, Ana, now dreading her upcoming marriage, enters therapy, while Daniel becomes consumed with lust for his sister.
* After all the goat screwing, mass murders, and rapes, it turns out the serial killer couple in ''IslandOfDeath'' are brother and sister.
* In the deeply fucked-up ''{{Film/Dogtooth}}'' (Greek title: ''Kynodontas''), this is taken to an extreme: [[spoiler:the parents let the son choose which sister he wants to have sex with after the woman Dad had been bringing home for him breaks the psychotic rules of the household and is ousted. She doesn't enjoy it.]] [[FromBadToWorse It Gets Worse.]]
* A possibly unintentional example, but in ''Film/{{Transformers}}'', according to Sam's [[http://tfwiki.net/w2/images2/c/c7/Witwickytree.jpg family tree]], the Witwicky family tree consists of two generations of inbreeding. This however might just be the fact that Sam did a terrible job researching.
* Used very disturbingly in ''Film/HenryPortraitOfASerialKiller.'' This trope is something of a BerserkButton for Henry, so when he walks in on his crime partner raping his own sister, he kills them both.
* ''Harry+Max'' is a film centered around two brothers who start having a sexual affair while dealing with being famous singers being exploited by their family and agents.
* In ''I Start Counting'', based on a novel by Audrey Erskine Lindop, a girl of 14 is in love with her 32-year-old adopted brother, even when she suspects he's the local sex killer. She makes an advance to him but he refuses.
* In ''Film/ThePeopleUnderTheStairs'', "Mommy and Daddy" (the villains) are eventually revealed to be incestuous brother and sister - and it's a family tradition going back who knows how many generations.
* In ''Sister My Sister,'' the protagonists are sisters who work as live-in maids for the same employer and eventually develop a sexual relationship. Based on a true story, too.
* ''Blood'', a 2004 Canadian movie is all about the dirty talk between sister and her brother, just released from jail. The whole action (nothing explicit) in the movie takes place in a room. But the movie has incestuous overtones.
* ''Film/FromBeginningToEnd'' is a Brazilian film about two half brothers who begin an incestuous affair. What's even odder is that their friends and family seem aware of their relationship and all right with it. [[spoiler:The older brother asks the younger to marry him shortly before the younger one leaves for three years to train in Russia for the Olympics.]]
* ''White Fire'' has an incredibly creepy take on this. The protagonist, Boris, is shown complimenting her sister in inappropriate ways and even takes her towel away from her after she went skinny dipping. When she dies, he meets a prostitute, who reminds Boris very much of his sister. As a result, he falls for her. It doesn't help that the prostitute gets plastic surgery to look exactly like the sister as part of a heist.
* Izzy from ''Film/SickGirl'' initially seems to just idolize her older brother, but as the film progresses it's revealed that she is in love with him, to the point of fantasizing that they are a married couple, and their younger brother is their son.
* Julie and Mike from ''Slasher''.
* The FreudianExcuse of the villain from ''Scrapbook'' is that he was raped by his sister and brother.
* The deformed cannibal twins in ''Film/WrongTurn2DeadEnd''. In one instance, the girl gets jealous and violent when she discovers her brother masturbating to the sight of a sunbathing woman. She kills the woman, and the two start to have sex afterwards.
* Although whether or not they actually had engaged in incestuous relations in the past is purposefully kept vague (according to the actors and producers), the mutual sexual attraction between criminal siblings played by Eric Bana and Olivia Wilde is most definitely intentional in the movie ''Deadfall'' and in fact drives a lot of the plot.
* In ''Film/ThatsMyBoy'', Donny discovers that his son Han's fiancee is having an affair with her brother. He tells Han, who calls off the wedding.

* The Creator/{{Troma}}[=/=]Astron 6 co-production, ''Film/FathersDay2011'', has a very explicit example. When the hero, Ahab, finds his sister, Chelsea, for the first time in ten years, he is stunned to see she has become a stripper, and developed into a beautiful, mature woman, and she actually comes onto him. They have sex. [[spoiler: Granted, at the time, Chelsea actually was possessed by a hellish demon that reproduces by possession women and stealing the sperm from men it has sex with - Ahab didn't know.]]
* ''Film/JugFace'': Ada's brother actually impregnates her.

* In ''Film/TwoThirtySeven'', we find out that [[spoiler:Marcus raped his sister Melody before the events of the film.]]

* In the ''Film/AlvinAndTheChipmunks'' films Beatrice Miller is AdaptedOut and replaced with Dave as the Chipettes' adopted parent. This makes them the adopted sisters of Alvin, Simon, and Theodore. The romance between the characters still exists.

* The twist in the Australian film ''Film/BeautifulKate'' is that Kate had sex with her twin brother Ned and older brother Cliff. Cliff then killed her in a car crash and committed suicide out of shame.

** Sebastian and Kathryn are FlirtyStepsiblings in this version. Kathryn offers to let him have sex with her if he wins TheBet, since (according to her), she's the one person [[TheCasanova he]] [[ForbiddenFruit can't have]]. [[spoiler:He wins, but when he comes to collect, she just laughs in his face, as by then he's genuinely in love with someone else. It's implied it's because she's jealous, though.]] He [[AttemptedRape tries to rape her]] in a deleted scene, but it was cut due to the director thinking (probably correctly) that it would cause the audience to [[MoralEventHorizon lose sympathy for him]].
** There's also the very funny parody of that film's semi-incestuous lust in ''Film/NotAnotherTeenMovie''.
--->'''[[Creator/ChrisEvans Jake]]''': That's disgusting. You're my sister!\\
'''[[AnythingThatMoves Catherine]]''': Only by blood!
** The much campier sequel features a pair of real-life [[{{Twincest}} twin sisters sharing a kiss]] in a shower while the [[YuriFan male lead watches]].
* ''Film/CurseOfTheGoldenFlower'': The crown prince, Wan, is having an affair with his stepmother and the imperial doctor's daughter. [[SupriseIncest To his horror]], he learns that [[Chan, the doctor's daughter]] is also his sister.

* ''Film/ElCid'': Prince (later King) Alfonso seems to have a bit of this going on with his sister Princess Urraca. Historians have speculated that the real Alfonso and Urraca may have been incestuously involved with each other.

* ''Film/CloseMyEyes'' is all about this: Richard (Creator/CliveOwen) has an incestuous sexual relationship with a sister he's not seen for years. It seems to be some kind of metaphor for the decadence and corruption of Thatcher's England.
* ''Film/CrimsonPeak'' has the heroine Edith noticing how unusually close her new husband is with his sister. Lucille is a spinster and lives with him in the house, the two always travelling together. Edith starts to suspect they're actually husband and wife pretending to be siblings. [[spoiler: They're actually incestuous siblings, and they murdered their mother after they were discovered]].

* In the 1982 ''Film/CatPeople'', Malcolm [=McDowell=] insists that his full sister Natassja Kinski have sex with him as the only way to continue their family. (They will turn into panthers if they mate with normal humans and must kill before they can be restored.) He says that their parents were full siblings as well.
* In the 1979 ''Caligula'', the title emperor has an affair with his sister Julia Drusilla, and plans to make her his empress.

* The plot of ''Film/TheCementGarden''.

* A big part of Miguel's mental unstability in ''Film/BloodyMoon'' is his lust for his sister Manuela.
* In ''Film/TheCrow'', this is the nature of Top Dollar's relationship with his half-sister Myca.

* In the mini series adaptation of Frank Herbert's ''Series/ChildrenOfDune'' there are strong incestuous overtones with twins Leto II and Ghanima. It's never outright confirmed but they do share many tender moments together, even kissing on the mouth when reunited in the end.

* A very tragic case in ''Film/TheFaceOfAnother''. A young nurse is exceptionally beautiful but is cursed with a massive scar that covers much of the left side of her face. Starved for human affection, she crawls on top of her brother one night and has sex with him. Then she kills herself the next morning.

* ''Film/ElCid'': Prince (later King) Alfonso seems to have a bit of this going on with his sister Princess Urraca. Historians have speculated that the real Alfonso and Urraca may have been incestuously involved with each other.

* ''Film/{{Curse of the Golden Flower}}'': Accidentally occurs, much to the newly discovered siblings' horror.

* In ''Film/{{Godzilla 2014}}'', the fact that the male Muto's egg and the female Muto's egg were found side-by-side in the same location indicates they're part of the same clutch. Possibly subverted as it's never shown if or how they mate, so the female may have been self reproducing. Completely subverted since what the male and female Muto came out of were cocoons not eggs, [[spoiler:you see eggs later in the film and they look nothing alike]].

* ''Film/{{Scarface 1983}}'': Tony Montana's violent protectiveness toward his sister Gina has definite elements of this, inspired by [[Film/{{Scarface 1932}} the 1932 film]] it was a remake of, which had its title character carrying on the same kind of relationship with his own sister. This, combined with the effects of his increasing cocaine addiction, culminates in Tony gunning down his best friend Manny after catching him with her (and after she and Manny had gotten ''married'', no less). Gina confronts Tony near the end about it as his mansion is being besieged by Sosa's killers and tries to kill him, but Sosa's men get her before she can reach him. This, among other things, is what finally drives Tony to take up his M-16 and go out with guns blazing.

* In ''Film/AmityvilleIIThePossession'' Sonny Montelli (based on Ronald Defeo, Jr.) is influenced by the evil in the house to seduce and have sex with his sister... who is totally on board with it, to judge by her later remarks.

* This is a plot point in the film ''Angels and Insects''.
* Very explicit in the 2006 Poe adaptation of ''The Fall of the House of Usher''. [[spoiler:In this case, the incest was a family tradition that already ran over 5 or 6 generations.]]
* In the 1995 film ''Literature/{{Haunted 1988}}'' (not in the original book, though), Christina has an unusually intimate relationship with her brothers, particularly the older one who uses her as his nude model. [[TheReveal As it turns out]], [[spoiler: the adult siblings were having sex regularly, their mother found out and killed them all, and everyone in the house is a ghost reliving their incestuous past]].

* The twist in the Australian film ''Film/BeautifulKate'' is that Kate had sex with her twin brother Ned and older brother Cliff. Cliff then killed her in a car crash and committed suicide out of shame.

* Crusty and Maggot of ''Film/AugustUndergroundsMordum'' infamy are introduced having rough sex with each other.

* In the ''Film/AlvinAndTheChipmunks'' films Beatrice Miller is AdaptedOut and replaced with Dave as the Chipettes' adopted parent. This makes them the adopted sisters of Alvin, Simon, and Theodore. The romance between the characters still exists.

* In ''Film/AugustOsageCounty'', middle sister Ivy and her cousin Charles are in a secret relationship. [[spoiler:Toward the end of the film, oldest sister Barb learns the truth - Charles isn't just the girls' cousin, he's their half-brother, the result of a brief affair between the girls' father and their mother's sister. Since Ivy has had a complete hysterectomy (due to cervical cancer) and can't have children, it's implied that she and Charles still follow through on their plan to go to New York together.]]

* ''Film/TheRockyHorrorPictureShow'': Riff-Raff and Magenta certainly seem to have a closer relationship than most siblings (just look at a certain phrase above...).
** [[AudienceParticipation Elbow Sex!]]