Evil Head

Evil Head is a 2012 pornographic horror film written and directed by Doug Sakmann, and cowritten by Joanna Angel. It is based on the 1981 film The Evil Dead and its two sequels.

The group ignores the broken window, and while Shelly goes to lie down, Ash, Linda and Scotty have a threesome in a bedroom. Shelly walks in on the three, and distraught over Scottys infidelity, runs out into the forest, where she is violated by possessed trees, turning her into a Deadite. Shelly returns to the cabin, knocks Ash out, and stabs Linda with a piece of bark she pulls out of her vagina, infecting the other woman with the evil. Shelly proceeds to seduce Scotty, have sex with him, and rip his throat and testicles out.When Shelly tries to attack Linda, Ash fends her off with a fireplace poker, and locks her in the cellar, but she escapes, and begins having sex with the now demonic Linda. Aroused by the sight of the two Deadites going at each other, Ash tries fingering Shelly, causing his hand to become possessed. Ash is forced to cut his hand off with a chainsaw, which he then uses to kill Shelly by forcing her ride the blade. ........

Source: Wikipedia