There's a fair amount of nudity throughout the Karnstein trilogy. The Vampire Lovers is probably the best of the bunch, largely due to the presence of Ingrid Pitt, who was one of the best actresses to work in these film. The zenith or nadir, depending on your point of view, comes with the final film, Twins of Evil. It features the identical twins Mary and Madeleine Collinson, whose qualification for the job was seemingly being the first identical twins to pose for Playboy. Something Patty and Cathy would never have done, let alone Angelique and Alexis.