Heat of Madness(1966)

Though seemingly normal Jonathan Wheelwright (KEVIN SCOTT) is in a seemingly normal relationship with his rich fiancée Susan (JENNIFER LLAIRD), the poor guy's got a few screws loose. Despite being a photographer who specializes in shooting nudes, Jonathan is remarkably uptight when it comes to sex. He even pulls away from Susan when things get too passionate. All that changes, however, when Jonathan is hired to shoot the stills illustrating a book called Famous Sex Murders. Hiring actors rather than models, and staging scenes 'just like little moving pictures,' Jonathan's soon running around shooting mock robberies, break-ins, whippings, and assaults including, rather hilariously, beating up a little old lady on a stairwell. And -- surprise, surprise -- all that fake violence starts to get to him.