Best movies like The Key

When an American woman begins a dangerous relationship with an attractive immigrant worker, in order to save her marriage, she finds her true self.

A disillusioned Los Angeles based married couple, whose twisted sexual relationship is told exclusively through their own private journal entries.

Living among fusty academics, an unusual young man gets between a high school history teacher and his wife.

Revealing women, showing men Dermatology professor Marie-Claire is embarking on a new project linking skin cells and sexuality, when unexpected events disrupt her professional, family and intimate life.

A struggling American writer and a fellow American expatriate begin a sordid affair among the chaos and discord of 1940 Paris, France on the brink of World War II.

Tales of eleven losers are told and interwoven. Burt can't satisfy Angel, so she seeks the arms of another man, who is caught by Angel in the arms of another woman. Angel ends up with Justin, who ends up with a co-worker's wife. As Angel and Burt argue, a sorceress watches, and eventually seduces Burt while Angel gets to know Ray, who had previously chased a blonde girl down on the coast. You get the idea.

Lorna has been married to Jim for a year, but still hasn't been satisfied sexually. While Jim is working at the salt mine, she is raped by an escaped convict, but falls in lust with him. Meanwhile Jim's buddies are giving him a hard time about Lorna's supposed infidelity, not realizing how close to the mark they really are. Trouble starts when Jim gets home early from work because it's their anniversary.

Stuck in a dull marriage, successful shrink Mia DuBois follows a patient's advice and exposes her wild side at a private underground club, where she meets a handsome stranger and begins an affair that may cost her more than just her husband.

Mac and Monica want to add an element of sexual intrigue to their marriage so they begin picking up men and playing games with them. Monica gets to add a little spice to her life, while Mac can fulfill his voyeuristic desires. But when they make their indecent proposal to the wrong man, everything changes, and Mac and Monica find they may pay for their desires with their marriage.

Steamy erotic thriller centering on Opella and Dan, a couple whose sexual fantasies get so wild, Dan wants to put a stop to them. When Opella is discovered dead, Dan contacts his brother to help him get rid of the body and cover his tracks, but the past soon comes back to haunt him.

Acclaimed actress Val Binnes decides to play a bold and uninhibited role in a controversial new movie for her ambitious, but neglectful and self-absorbed director husband Peter. Val finds herself becoming too caught up in the risqué part, throws caution to the wind, and has an adulterous affair with her hunky, but arrogant leading man Rick. Can Val and Peter's marriage survive the pressure and problems of making the picture?

A writer has torrid fantasy affairs with young men.

A middle-aged husband of a younger woman finds her youth intimidating to the point that he cannot become aroused. His solution involves the introduction of his daughter's lover to his wife.

Kurosaki is an erotic novelist who uses his editor and a hired model to act out scenarios in his living room to use for inspiration in his writing. His wife Shizuko calls him a pervert but on the inside, she feels physically neglected. She tries to make him jealous, while also going after what she desires with someone else.

When an ancient and erotic hunger is awakened in the far reaches of sexy space, the Alterian High Council sends newly ordained Collector Maxy Prime to investigate with her nimble nympho sidekick, Gab-E J'nx. There they discover a mad(ly hot) professor and her students in the psychosexual grips of the Thanagarian Pleasure Pod, a mega-parasite who’s giving everyone good vibrations while slowly and seductively sapping them of their very life essence. Will the Femaliens put an end to this tentacle terror, or will they succumb to the beast’s cosmic crush?

Ikuko is a mature, reserved Kyoto woman married for many years to a respectable, now-middle-aged man. The only problem in their relationship has been that her husband is dissatisfied with her lack of passion during lovemaking. All this changes after they meet the young Mr. Kimura

Often daydreaming, Mei Liu, who was immersed in strange fantasy, was once a member of a well-known girl idol group. Unfortunately, the boss of the brokerage company even fled the money, and she was deceived and forced to carry huge debts. In order to pay off the arrears, Meiliu applied to become a maid service staff in the country hotel, helping the service blame the tenants for their lives.

Chizuko's cab driver husband becomes impotent after an accident, leading to infidelity spiced up with various kinky deviations.

A young and beautiful woman goes to stay with her "eccentric" brother in the country. He - a crazed millionaire painter - is entranced by his sister's beauty, the very reason they were separated in their youth. Unable to hide his yearning for his own flesh and blood, the lady of the house decides to take matters into her own hands to preserve her status...

Scorching erotic melodrama in which an escapee from an island prison finds refuge in the house of a frustrated wife. The convict and the woman carry on a steamy affair, much to the chagrin of her husband--who happens to be in charge of the prison--and his sleazy friend.

A high school science teacher is popular among male students, and this worked out badly for her...

In a twisted maze of ex-lovers, old grudges, and new spouses, friends who haven't seen each other in 20 years fall down a rabbit hole of alcohol-fueled bad decisions.

When three women get cheated on by their husbands they decide to get even and open up The Mistress Club, where seduction is the name of the game and forbidden sex is the natural outcome.

A married couple become involved with a secret society catering to rich people's sexual fantasies.

Fumi is by “Kagami-Ike Pond”, deep in the mountains… Her class room teacher could not fight his strong urge as he watched her body through her blouse drenched in rain…Keisuke waits for Fumi at the meeting spot to confess his love. Classmates surround Keisuke. Fumi and the teacher both went missing on that rainy day. A few years later…Keisuke had left his life in Tokyo, and attempts a handgun suicide, but is spotted by his old classmates Kohei and Tatsumi. They explain to him their plan of starting a fraudulent business of selling water from Kagami-Ike pond as “The Water of Eternity” via the internet, and tell him that he should join them. They were also classmates with Atsuko, Kohei’s girlfriend, is also delighted to know that he had returned home.

Cardiac surgeon Alex Marsden has an affair with Marcella Duggan, but then finds himself having to operate on her husband Larry, who is also his friend.

Mark, along with his girlfriend, Tracy, decided to go to the mansion to get some rest, where they were met by the hostess named Colette. After a while, their company joined Denise, who at this point had a quarrel with her boyfriend Paul. All together they had nice time told stories to each other, on topics related to love and sex, and sometimes tested them to the practice ...

Natsu (Maria Wakatsuki), a female college student, had a physical relationship with the fairness of her circle friends, even though she had a boyfriend named Shugo. However, just because fairness is more compatible with the body than Shugo, there was no particular feeling of love. Natsu sometimes asks herself, "Why do you fall asleep with a man you don't like?" At that time, I used to talk to my friend Noa (Maina Yuuri). However, one day, an incident occurred in which Noa's ex-boyfriend Masaya committed suicide in front of her because she was angry with Noa...　

The Showa period was ending and the era was about to change to the Heisei period. Newlyweds Chikage and Ryuhei argued over trivial matters, but at night they made up for it with sex.

A wealthy yuppy couple find that their lives are being invaded by another, intrusive couple who are out to rip them off and terrorize them.

Frank and Bethany are happily married in a loving but unfulfilled relationship. To satisfy her carnal urges, Bethany begins working night at an upscale brothel - not for the money, but simply for the thrill of it! She lives happily until one night she is recognized by Paul, a client of her husband's business. When Paul threatens to blackmail her, she decides to tell Frank the truth, hoping he will forgive her. But what Frank sees instead is an opportunity to explore his own dark fantasies! Will Bethany's secret ruin their marriage, or open the door for them to a new era of sexual possibilities?

A woman and her fiancée create a sexual to-do list of all the people they want to sleep with before getting married.

Nikkatsu Roman Porno

An abused housewife has an affair with a sportswriter. The two of them gradually fall in love as their relationship develops.

A cop and his sexually frustrated wife are struggling to keep their failing marriage intact, when by chance she finds that he is at heart a voyeuristic peeping tom. To satisfy him and herself, his wife has numerous affairs, which her husband watches on closed-circuit televison. However, the pair soon learn that when you play with fire, you'll always get burned.