Movies Like Step Brother Sister Perversions 18

If you liked Step Brother Sister Perversions 18 (2021), a movie, here are 20 movies with a similar feel, based on TMDB's recommendations. Each one links to its cast, trailer and where it's streaming.

1
The War Zone (1999)
★ 6.8/10
An alienated teenager, saddened that he has moved away from London, must find a way to deal with a dark family secret.
2
Shame (2011)
★ 6.9/10
Brandon, a thirty-something man living in New York, eludes intimacy with women but feeds his deepest desires with a compulsive addiction to sex. When his younger sister temporarily moves into his apartment, stirring up…
3
Martha Marcy May Marlene (2011)
★ 6.6/10
After several years of living with a cult, Martha finally escapes and calls her estranged sister, Lucy, for help. Martha finds herself at the quiet Connecticut home Lucy shares with her new husband, Ted, but the…
4
From Dusk Till Dawn (1996)
★ 7.1/10
After kidnapping a father and his two kids, the Gecko brothers head south to a seedy Mexican bar to hide out in safety, unaware of its notorious clientele.
5
Porno (2019)
★ 6/10
When a group of naive teens working at a movie theater in a small Christian town discover a mysterious film hidden in its basement, they unleash an alluring succubus who gives them a sex education…written in blood.
6
Never Back Down: Revolt (2021)
★ 6.3/10
An amateur fighter is lured by a trafficking syndicate specializing in elite underground fighting where her brutal captor forces her to fight or face certain death.
7
Bone Lake (2025)
★ 5.9/10
A couple’s romantic vacation at a secluded lakeside estate is upended when they are forced to share the mansion with a mysterious and attractive couple. In this darkly hilarious and seductive horror story, a dream…
8
Nymphomaniac: Vol. II (2013)
★ 6.7/10
The continuation of Joe's sexually dictated life delves into the darker aspects of her adult life and what led to her being in Seligman's care.
9
Bring Her Back (2025)
★ 7.3/10
Following the death of their father, a brother and sister are sent to live with a foster mother, only to learn that she is hiding a terrifying secret.
10
Happiness (1998)
★ 7.4/10
The lives of several individuals intertwine as they go about their lives in their own unique ways, engaging in acts which society as a whole might find disturbing in a desperate search for human connection.
11
Money Train (1995)
★ 5.9/10
When a vengeful New York transit cop decides to steal a trainload of subway fares, his foster brother—a fellow cop—tries to protect him.
12
The Little Death (2014)
★ 6.7/10
A comedy film that looks into the loosely connected lives of people with strange sexual fantasies.
13
Ginger Snaps (2000)
★ 6.9/10
The story of two outcast sisters, Ginger and Brigitte, in the mindless suburban town of Bailey Downs. On the night of Ginger's first period, she is savagely attacked by a wild creature. Ginger's wounds miraculously…
14
Female Trouble (1976)
★ 6.9/10
Teenage delinquent Dawn Davenport, incensed after her parents do not give her the cha-cha heels she wanted for Christmas, runs away from home. After an illegitimate child and hairstylist husband bring her more misery…
15
Funny Games (2008)
★ 6.5/10
When Ann, husband George, and son Georgie arrive at their holiday home they are visited by a pair of polite and seemingly pleasant young men. Armed with deceptively sweet smiles and some golf clubs, they proceed to…
16
The Krays (1990)
★ 6.1/10
Twins Ronnie and Reggie Kray are raised in east London, under the influence of their hateful but doting mother Violet. As they grow up, Ronnie's violent nature takes over, and Reggie follows his brother's lead. The two…
17
Citizen Toxie: The Toxic Avenger IV (2001)
★ 6/10
A horrific explosion creates a dimensional portal between Tromaville and its dimensional mirror image, Amortville. While the Toxie is trapped in the mirror dimension, Tromaville comes under the control of his evil…
18
We Die Young (2019)
★ 6.8/10
Lucas, a 14-year-old boy inducted into the gang life in Washington D.C., is determined that his 10-year-old brother won't follow the same path. When an Afghanistan war veteran comes into the neighborhood, an…
19
Saw VI (2009)
★ 6.3/10
Special Agent Strahm is dead, and Detective Hoffman has emerged as the unchallenged successor to Jigsaw's legacy. However, when the FBI draws closer to Hoffman, he is forced to set a game into motion, and Jigsaw's…
20
Addicted (2014)
★ 5.9/10
A gallerist risks her family and flourishing career when she enters into an affair with a talented painter and slowly loses control of her life.