A Wife's Secret (2014) - ?

A woman who moonlights as a paid companion runs into trouble when her husband's friend shows up at her place of employment.

Club V.R. (1996) - Gary Hudson

Quote:
Virtual reality is a natural for softcore films since anything can happen at any time, including non-stop nudity and simulated sex, because VR is only limited by the imagination. So far that potential is largely unexplored. For some reason, most of the couples erotica films based on this premise seem to be whodunnits, where someone dies during a VR session, and a detective must enter VR to catch the killer.

This time, the victim is practically "Mr. VR," and the location is an exclusive Beverly Hills VR club. Detective Kate Rodger is assigned the case. She lives with her boyfriend and former partner who was shot and disabled in the line of duty, and her belief that it was her fault has made her unable to respond sexually to him. When she is forced to enter the VR world to look for clues in the victims past sessions, she is an easy target for seduction. Meanwhile her significant other begins to suspect that he should be jealous of VR. The film remains fairly tightly focused on Kate Rodger, her investigation and her growing addiction to virtual reality.

Messalina: The Virgin Empress (1996) - Joe D'Amato

Description: It's the year 43 AD. Claudius reignes the Roman Empire, with Messalina,his attractive wife as Empress at his side. Messalina is a nymphomaniac, sex-obsessed woman who mercilessly exploits the domination of her husband to satisfy her unsatibly lust. Actively supported by Agrippina, Messalina turns the Roman court into a squalor of vices and perversions. One day, however, the emperor finds out whats going on behind his back and his revenge is cruel!

Virgin People (1984) - Celso Ad. Castillo

IMDB:
Three sisters live in a paradise where men are metaphorically and literally serpents of temptation. Their father takes his three daughters deep into the woods, far from the nearest town. He dies, leaving the girls educated enough to read from the Bible, ignorant enough to allow men to take advantage of them.

Muschimaus mag's grad heraus (1973) - Hubert Frank

Synopsis:
Frivolous Senta (Ulrike Butz) is thrown out of her residence for a reason later explained. Owning just a suitcase and the clothes on her back (a raincoat) she decides to hitch a ride. To help achieve her goal she flashes her naked body to an unsuspecting driver, who crashes his car in disbelief. This little stunt lands her in court, but since she has no money to pay for the damages she is sentenced to... write down her memoirs! Inspired by classic erotic literature, Senta's writings predominantly feature her past sexual encounters - presented as flashbacks - up to the point which led her into court.

La donneuse AKA Naked and Lustful (1979) - Jean-Marie Pallardy

Plot :
Jean-Paul Leforestier a is a successful engineer with a beautiful young wife. Despite the fact that this couple would seem to have it all, the one thing they want most is the very thing that eludes them - a true family. Upon seeking a professional opinion on the matter, the couple is advised to seek out an anonymous surrogate. Though the procedure is a success, Jean-Paul becomes entirely consumed in his quest to discover the identity of the young woman (Willeke van Ammelrooy) who is currently carrying his child. Upon coming face to face with the ravishing young beauty, Jean-Paul initiates a torrid affair that will profoundly affect the lives of all involved. (Jason Buchanan, Rovi )

Auf ins blaukarierte Himmelbett (1974) - Alois Brummer

Synopsis:
This is probably Alois Brummer's best film - but before you all rush out and buy it, be warned that this is a judgement relative to his other output, and we are not exactly talking about the prime achievements of European cinema in the 20th century.
The story lines about a village gone mad about a suspected treasure and about antagonistic neighbours and their decidely less antagonistic offspring are very typical for plays popular at "Volksbühnen", i.e. non-subsidised theatres specialising at popular (often rural) comedies. Fittingly, some of the cast come from that background.
What is unusual for Brummer's work is that the story lines are actually seen through, resulting in a coherent whole. Some of the tension in the plot is of a sexual nature and thus suitable for the sex comedy treatment, but that dosage of sex clearly does not suffice for the demands of the genre. Therefore lots of entirely gratuitous nudity is added.