Karin Lorson had a pseudonym "Doris Denberg" . Here are three posters with that name :
1) "Hausfrauen Report International" (1973)
2) "Hausfrauen-Report 4" (1973)
3) "Die Munteren Sexspiele unserer Nachbarn" (1977)
Afterwards found that info is already on OFDB.de , but Google does not associate Doris Denberg with Karin Lorson .
EGAFD , IMDB , IAFD , etc. doesn't have such info