Forced Entry is a 1973 pornographic film written and directed by Shaun Costello under the pseudonym Helmuth Richler. It stars Harry Reems as an unnamed and psychotic Vietnam War veteran who sexually assaults and kills random woman who stop at the filling station where he works as an attendant. Called one of the most disturbing and unpleasant porn features ever made the film utilizes actual footage of the war, predominantly in the rape and murder sequences.
Going back an unspecified amount of time, the man is revealed to be a gas station attendant, and is shown coercing a female customer into giving out her name and address by claiming they are needed for a credit card transaction. After the woman drives away, the attendant goes to her apartment building, and watches through a window as she has sex with her husband. When the husband leaves, the attendant breaks into the apartment and forces the woman to perform oral sex on him while he verbally abuses her, slitting her throat after he climaxes.Back at the gas station, the attendant gives a lost motorist directions, and follows her to the address she was looking for. The man breaks into the house, drags the woman out of the shower, and forces her to fellate him at gunpoint. He then sodomizes her, stabs her, and kisses her as she dies. Later, a ditzy female hippie picks up an equally vapid hitchhiker, and the two travel to the gas station. The attendant tricks the driver into giving out her address, and goes to her home, where she and her companion are doing drugs, and having sex. The attendant sneaks in and tries to force the girls to submit to him, but the pair are too intoxicated to take him seriously, frustrating him to the point of a psychotic break. As he screams Stay away from me and has a series of flashbacks to both the war and the rapes and murders he has committed, the attendant shoots himself in the head. Returning to the intro, the mans body is covered by a sheet, and hauled away by the police. ........
Source: Wikipedia