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  • In 2:37, we find out that Marcus raped his sister Melody before the events of the film.
  • In the Alvin and the Chipmunks films, Beatrice Miller is Adapted Out 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 Amityville II: The Possession 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.
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  • Angels & Insects is about William, who becomes enamoured of Eugenia, but her snobbish and spoilt brother, Edgar, dislikes William, at first apparently due to his humble origins. When William and Eugenia have children, she calls the one son Edgar after her brother, ostensibly in the family tradition, annoying William. Then William walks on Eugenia and Edgar engaging in incestuous sex. Eugenia then confesses that this has occurred since childhood and that a previous fiancé committed suicide in consequence. William realises that their has been used to conceal the incest and that the children (who bear no resemblance to him) are Edgar's.
  • Antonia's Line: Danielle finds Pitte in the barn raping his sister.
  • Ararat: Raffi carries out an affair with his step-sister Celia, which he justifies using the Not Blood Siblings rationale.
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  • Atonement: The actor playing Leon, Cecilia and Briony's brother, believed that Leon and Cecilia's relationship had elements of incest; director Wright commented that 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.
  • Ator The Fighting Eagle: 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.
  • In August: Osage County, middle sister Ivy and her cousin Charles are in a secret relationship. 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.
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  • August Undergrounds Mordum is about a Terrible Trio of Serial Killers; Peter, his girlfriend Crusty, and her brother Maggot. The film opens with Peter walking on Crusty and Maggot having rough sex with each other.
  • The twist in the Australian film Beautiful Kate 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.
  • Bliss: Harry's son, David insists that Lucy, his sister, would perform sexual services for him in exchange for drugs. This episode doesn't lead to any dramatic consequences later on.
  • 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.
  • In Bloody Moon, a big part of Miguel's mental instability is his lust for his sister Manuela.
  • Borat:
    • Both Borat and his late wife were conceived by his hometown's local rapist.
    • Borat casually makes out with Kazakhstan's fourth best prostitute, before introducing her as his sister.
    • Borat's sister apparently made the mistake of sexually taunting their mentally disabled brother Bilo through the bars of his cage, and paid the price.
  • Brotherhood of the Wolf: It's never quite clear what exactly happens outside of his mind, but Jean-François looks quite psychotic and very obviously lusts after his sister Marianne. And he ends up raping her.
  • In the 1979 Caligula, the title emperor has an affair with his sister Julia Drusilla, and plans to make her his empress.
  • In the 1982 Cat People, 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.
  • El Cid: 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.
  • Climax: Taylor is extremely protective of his sister Gazelle and gets uncomfortably close to his sister at points, especially during the opening interviews. He makes good on his attraction to her once the LSD kicks in, seducing her despite her saying it's wrong. It's left ambiguous if Taylor did rape his sister: they're only seen after the time cut sharing the same bed, where even though Gazelle doesn't recall anything occurring, she is asked to not "tell Papa" by her brother.
  • Close My Eyes: Richard (Clive Owen) 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.
  • 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. IMDB link
  • Crimson Peak 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. They're actually incestuous siblings, and they murdered their mother after they were discovered.
  • The Crow: Top Dollar and Myca are half-siblings who are open about their sexual relationship and their villainy.
  • Cruel Intentions:
    • In the film, Sebastian and Kathryn are Flirty Stepsiblings. Kathryn offers to let him have sex with her if he wins The Bet, since (according to her), she's the one person he can't have. 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 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 lose sympathy for him.
    • In Cruel Intentions 2, a pair of identical girls (who claim to be Kissing Cousins, but are played by real-life twins) share a kiss in the shower while the male lead watches.
  • Curse of the Golden Flower: The crown prince, Wan, is having an affair with his stepmother and the imperial doctor's daughter. To his horror, he learns that Chan, the doctor's daughter is also his sister.
  • The Dangerous Live Of Altar Boys: Margie was molested by her older brother Donny, a fact that she reluctantly reveals to Francis, who then reveals this to Tim, setting in motion the events that drive the third act.
  • Daniel And Ana: In this 2009 Mexican drama, 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.
  • 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.
  • The Devil's Rejects features Otis and Baby, who refer to each other as brother and sister (even though they aren't blood-related) and are quite comfortable acting sexually around one another. Otis demands to know why one of their victims is not turned on by his "sister" at one point. The actor who plays Otis has admitted to reminding himself multiple times on set that she was the boss's wife (smoking hot but unavailable), and her Real Life brother has a cameo in the movie (as a cop).
  • D.O.A.: In the 1988 remake, it is revealed that the murder victim and his long-term girlfriend were brother and sister. Neither of them knew it.
  • In the deeply fucked-up Dogtooth (Greek title: Kynodontas), this is taken to an extreme: 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. It Gets Worse.
  • The Dreamers: It is heavily implied, though never explicitly confirmed, that twins Isabelle and Theo are infatuated with each other. However, at the very least Isabelle was a virgin until sleeping with Matthew.
  • In Enter the Void, it's heavily implied to be the case between Oscar and his sister since he watches her sleep (in the nude no less) and the fact that he is repeatedly shown watching her dance in the strip club. There are also several instances where she kisses him and it's a little more than a peck on the cheek. Aside from that, Oscar flies into the bodies of her lovers while she has sex with them, watching the act from their POV's. He even flies inside of her at the climax and we get an inside view of her vagina during intercourse. Adding an extra layer of discomfort is the possibility that he's thinking of her as his mother through all this, with whom he's also implied to have been infatuated with: In at least one flashback Oscar spies on his parents while they're in the bedroom, when he has sex with an older woman in the present, he immediately flashes back to being breastfed, and in the climax, there's a sex scene involving the same woman; when Oscar flies into the man's head to see things from his POV, she's replaced by his mother.
  • The Face of Another: 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 2006 adaptation of Edgar Allan Poe's The Fall of the House of Usher, incest was a family tradition that already ran over 5 or 6 generations.
  • Father's Day (2011): This Troma/Astron 6 co-production 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. Granted, at the time, Chelsea actually was possessed by a hellish demon that reproduces by possessing women and stealing the sperm from men it has sex with - Ahab didn't know.
  • The Field Guide to Evil: Strongly implied between Xaver and Anni in "A Nocturnal Breath", and almost certainly the reason for Anni's possession by the drude.
  • Flowers in the Attic: This adaptation removed much of the incest between 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. Word of God is that the incest was originally included, but cut due to negative reactions from test audiences.
  • From Beginning To End 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. 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.
  • Ginger Snaps
    • The film heavily links lycanthropy with sex; this becomes particularly Squicky when Ginger suggests Bridgette should let Ginger bite her so they can be their own pack.
    • Ginger Snaps Back: The Beginning: This sequel places the characters in the eighteenth century... somehow... makes the incestual relationship even more explicit, 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...
  • Gladiator: Emperor Commodus plans to do this with his sister whether she wants to or not (she doesn't), but never gets the chance. That and threatening her son make a good Kick the Dog moment, though.
  • In 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, you see eggs later in the film and they look nothing alike.
  • In Harold & Kumar Escape from Guantanamo Bay, the titular duo encounter an Ugly Guy, Hot Wife 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.
  • 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.
  • Haunted (1988): In the 1995 film (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. As it turns out, 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.
  • Hellboy II: The Golden Army: Prince Nuada seems to have a lot of sexual tension going with his sister Princess Nuala. The presence of implied incest was confirmed by Nuada's actor, and in the commentary by the director.
  • Henry: Portrait of a Serial Killer: When Henry walks in on his criminal partner raping their own sister, he kills them both.
  • Hold the Dark: It is implied that Medora and Vernon Slone are siblings. 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 Unholy Matrimony and murderous shared psychosis.
  • The Hotel New Hampshire is about the lives of the five Berry children, two of which, John and Franny, are eventually revealed to be in a relationship with each other. It's a rare case where it doesn't end badly.
  • 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 Squicky sex life with her brother. The two even resort to murdering their own mother to keep their relationship a semi-secret.
  • Island of Death: After all the goat screwing, mass murders, and rapes, it turns out the serial killer couple are brother and sister.
  • I Start Counting: Based on I Start Counting, 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 Joe Dirt, 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?
  • Jug Face: Ada's brother actually impregnates her.
  • In Lemonade Joe, there is one Triang Relation drawn throughout the movie. Doug Badman is hopelessly in love with Tornado Lou, a Chanteuse and Soiled Dove who works for him. She doesn't reciprocate his feelings, but falls hard for the Ideal Hero Joe whose love she thinks will make her a better woman. He's a Celibate Hero and doesn't love her back. (Instead, he later falls in love with pure and innocent Winnifred Goodman.) At the end of this hilarious Troperiffic Cliché Storm of a movie, it's revealed that both Doug and Lou are Joe's Long Lost Siblings.
  • Lone Star: This John Sayles' film has the main character and his love interest find out the reason why his much hated father kept them apart while they were teens; they're half-siblings. Since she is sterile, they decide to move somewhere where their biological connection won't be known and go on with the relationship.
  • Love Sick: In this Romanian movie (Legaturi Bolnavicioase), there is a college girl who sleeps with her brother and is in love with her best friend. Who is also a girl.
  • In The Mansion, 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).
  • Mr. Nobody: 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.
  • My Chauffeur: The male and female lead characters hump like bunnies. The next day they find out they might be brother and sister. Hilarity Ensues.
  • Not Another Teen Movie: When they parody Cruel Intentions, a brother objects to sex with his sister, who points out that they're only related by blood.
    Jake: That's disgusting. You're my sister!
    Catherine: Only by blood!
  • 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 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.
  • The Other Boleyn Girl: 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 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 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).
  • In The People Under the Stairs, "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.
  • Repo! The Genetic Opera 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!
  • The Rocky Horror Picture Show: Riff-Raff and Magenta certainly seem to have a closer relationship than most siblings.
  • The Royal Tenenbaums: Richie is in love with his adopted sister Margot, and struggles because he knows that these feels are unacceptable by society's standards, contributing to his failing mental health.
  • Say It Isn't So 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 Hilarity Ensues when Gilbert repeatedly goes to great lengths to convince Jo that they aren't related. After they get married, a 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... using posters of said celebrity as masturbation fodder in his teen years.
  • 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 he and Aline aren't related, and steps aside so Andre can marry Aline.
  • Scarface (1983): Tony Montana's violent protectiveness toward his sister Gina has definite elements of this, inspired by 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.
  • Scrapbook: The Freudian Excuse of the villain is that he was raped by his sister and brother.
  • In The Seeker, there is a distinctly unsisterly vibe towards Will from the youngest sister.
  • Sheitan: During the drunken Christmas Eve feast, Joseph tells his guests a folktale about a fearless peasant who was goaded by the Devil into having sex with his sister, and the demonic child who would be born of this union. The story is actually about Joseph, and his pregnant 'wife' is really his sister.
  • Shock Corridor: Johnny fakes desiring and attempting it with his pretend sister to get committed.
  • Shock Treatment: Drs Cosmo and Dr Nation McKinley (Richard O Brian and Patricia Quinn) have an explicitly BSI relationship 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.
  • Izzy from Sick Girl 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.
  • In A Simple Favor, 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 Held Gaze 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 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.
  • The 2007 German slasher film Slasher is about Erin and her friends encountering Mike, a local serial killer disfigured in a fire and held responsible for murdering four girls. In the climax, not only is it revealed that Mike targeted Erin because she was the one who set the fire that caused his disfigurement in the first place, but that one of Erin's friends, Julie, is actually Mike's accomplice, being his older sister and lover. And then is it revealed that Erin was the one who tortured and killed the four girls that Mike was thought to have murdered in the first place.
  • In Something Wicked Christine's brother Bill is shown to be attracted to her, watching her getting dressed or having sex with her boyfriend. She later uses it to her advantage by framing him off her murders, making him look like a Crazy Jealous Guy.
  • In That's My Boy, Donny discovers that his son Han's fiancee is having an affair with her brother. He tells Han, who calls off the wedding.
  • This World Then The Fireworks, a 1997 film noir with Billy Zane and Gina Gershon as a pair of twins who commit cons and are involved in an incestuous relationship.
  • Through a Glass Darkly: 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.
  • Transformers: According to Sam's 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.
  • Tromeo and Juliet:
    • 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. Which, as Oancitizen pointed out, foreshadows the ending.
  • In Unconscious, it turns out by the end of the film that Alma and León are half-siblings, which is why he runs away at the beginning. He was adopted, and they married unknowingly.
  • 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.
  • White Fire: 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.
  • The Woodsman: The backstory for the protagonist's love interest, Vicki, is that she was molested by her three brothers.
  • Zathura: Lisa develops a crush on the hunky astronaut, who turns out to be an older version of one of her brothers. Once she learns this, she is, understandably, squicked out.

Alternative Title(s): Films

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