Sisters (1973) is a horror movie directed by Brian De Palma and starring Margot Kidder as a model who invites a man over to her apartment for a night of eros. It ends, though, with a morning of murder when Margot’s separated conjoined twin kills the lover. Oh well, at least he got his rocks off first. Trouble is a reporter in the neighborhood saw the murder, calls the police, but by the time they arrive the crime scene has been cleaned of all evidence or even the hint of wrongdoing. So, we got a plot that engages, but what about skin that engorges our member? Margot is seen briefly topless in a scene and then in a see-through negligee. It helps add to the sexiness that she speaks with a French accent.