Thundercrack!

Thundercrack is a 1975 American pornographic black comedy horror film written, edited, shot, and directed by Curt McDowell and written by George Kuchar based on a story by McDowell and Mark Ellinger. Combining an old dark house mystery with hardcore sex scenes, Thundercrack is more recently regarded as a cult film.

As the night goes on, more and more visitors appear to shelter from the storm. Among them is Chandler Mookie Blodgett, widower of the incredibly wealthy Sarah Lou Phillips, whose family owns the largest girdle factory in the United States. Their popularity is such that few American women are without one. Chandler relates the story of his wifes death. She burned to death at a cocktail party, where there was a freak accident and her girdle caught fire. This caused burning rubber to envelop her head, and finally she fell dead into the swimming pool, her head steaming. This causes Chandler to have a bizarre sexual dysfunction. Although initially attracted to women, they would invariably prove to be owners of House of Phillips girdles. When they took off their clothes before sex, he would be reminded of the death of his wife and would not be able to maintain an erection. For this reason he had been having sex with other men, as they dont wear girdles that would remind him of Sarah Lous horrific immolation. Rather strangely, during the telling of this story, Chandler is being fellated by Sash Melinda McDowell and has no apparent erectile problems. The two, while in the basement, discover that Mrs. Hammond had pickled the remains of her husband and kept them in a jar. She tells of the death of her husband, who had been working one day in the grain bin and got covered with grain dust. A swarm of locusts dove on him to eat the dust and in the process devoured much of Mr. Hammonds body.During the course of the night, many of the guests have sex with each other in various combinations. There are a great many sex toys at Prairie Blossom. Mrs. Hammond explains that her son collected them. They would be delivered in plain brown packages which she would take to him with his morning breakfast. This causes her to wistfully repeat that he no longer exists. One of the guests, a man named Toydy, becomes obsessed with finding the key to a locked door in the house. One of the female gue

Source: Wikipedia