One of Vincent Price's less than stellar efforts. From Wikipedia:
Filming began in November 1966. Knowing that local censors would prohibit filming, Towers gave them a copy of Abe Lincoln in Illinois and hired an actor to walk around the set dressed like Abraham Lincoln in case the censors dropped by.
According to Price in a 1984 interview, he had been signed on to the project without full knowledge of what the film would be about. After his scenes were shot, "Martha Hyer and I were led off...so we went to visit on the set and we found that they were remaking all of the scenes we'd been in, but a pornographic version of it." He added, "I never got to see it."