How many movies have Debra Christian and Kathy Hilton acted in together?

They have worked on 4 movies together! Their first movie together was The Maltese Asparagus (1970) while their highest rated movie together was The Flanders and Alcott Report on Sexual Response (1971). They have not worked together since Bucky's '70s Triple XXX Movie House Trailers Volume 2 (1994).