Movie from the 1950s where two sisters have sex

A headstrong young teacher in a private school in 1930s Edinburgh ignores the curriculum and influences her impressionable 12-year-old charges with her over-romanticized worldview.

Muriel Spark's classic novel The Prime of Miss Jean Brodie was adapted by Scottish Television into a seven episode television serial for ITV in 1978 that featured Geraldine McEwan in the lead role. From Wikipedia.

Cosmo Vittelli, the proprietor of a sleazy, low-rent Hollywood cabaret, has a real affection for the women who strip in his peepshows and the staff who keep up his dingy establishment. He also has a major gambling problem that has gotten him in trouble before. When Cosmo loses big-time at an underground casino run by mobster Mort, he isn't able to pay up. Mort then offers Cosmo the chance to pay back his debt by knocking off a pesky, Mafia-protected bookie.

A sexual love film depicting the sexual intercourse of a man working at a host bar with two sisters.

Debbie and Mary are loving sisters, and they share a special bond – when Debbie feels something, Mary feels the same thing! So when Debbie is having sex on a date, Mary is at home masturbating! The girls meet a pair of horny guys who take the two sisters to their toy store, and then teach them an exciting new game. They’re going to learn how to play doctor! For those with a refined taste in classic erotica, you’re in for one hot and sexy treat!

Faced with a broken marriage, a woman decides to try to rekindle incestuous relationship with her younger sister, who is married to a wealthy older man.

Two girls nestle beside each other on a couch and try desperately to conceal their mutual craving. Sexuality is suggested through the weird rhythm of the film's editing and the tactile quality of the images. - MIFF

A prudish woman is initiated into a more sexually adventurous life by her slutty sister. Not to be confused with the Gérard Loubeau porn film of the same name.

Italian Incest Fantasy Movie – Sisterly Love – Two Promiscuous Sisters Confront Each other In Sexual Duel Without Rules. In The End, It Leads To Incest Sex Between Them.

Two very different sisters have sexual relations with the same man.