Dr. Schäfer is based on Gero Wecker, who was the producer of all Oswalt Kolle movies and produced many sex-themed movies.
Many aspects in the movie are taken from Kolle's movie Your Child, That Unknown Creature (1970). It features nudity scenes of Kolle's family, the relationship of Cornelia etc.
The character Jupp is based Jupp Paschke, the make up artist of Oswalt Kolle's movie.
The comparing of the sexual partners with musical instruments, that is quoted by Christiane in this movie, was not only used in former articles of Oswalt Kolle, but was also used, in different words, in the final scene of Kolle's movie The Miracle of Love (1968).