The Devil's Chair (2006)

The British frightfest The Devil's Chair (2006) begins when Nick West (Andrew Howard) and his girlfriend Sammy (Pollyanna Rose) decide to drop acid and have sex in an abandoned asylum. When they find an old electric chair refitted as a sadistic sex chair, Sammy decides it would be fun to get strapped into it and dies horribly at the hands of supernatural entities as a result. Nick is blamed for the murder and goes to prison, but years later he returns to the scene of Sammy’s death with a psychiatrist and his students and the slaughter begins. There’s no nudity, but we do get to see sexy blonde Elize du Toit in her underwear.