I assume from your knowledge of such an obscure European "exploitation" film that you appreciate French/Italian arthouse/genre cinema. Never heard of that film, but will definitely check it out. I've heard of Karin Schubert, she was in some Italian horror movies known as gialli (a favorite genre of mine) before she went into pornography in the last years of her career to raise money to send her son to rehab, I believe. Later she seems to have disappeared off the face of the earth, with no trace of her whereabouts at present, although given her prior suicide attempts, it looks as though she might have met her fate in such a manner. Anyhow, French films that expose the sordid and miserable side of the pornographic/prostitute business were popular in France at the time. A similar French picture was released only a year later in 1974, L'Important C'Est D'Aimer" (That Most Important Thing: Love) starring the hauntingly beautiful German thespian Romy Schneider, in which she incarnates a washed up actress who has resorted to soft pornos to support herself. A young photographer feels sorry for her after witnessing her breaking down in the middle of a film production, and discreetly borrows money from some gangsters to finance a theatrical production of Richard III, with her in the role of Lady Anne (the temepestuous Klaus Kinski in the titular role). Gradually falling in love with her in spite of her loyalty to her depressed producer husband (a rare and admirable quality) who she does not love but does not wish to leave due to him having saved her from becoming a prostitute; tragedy ultimately befalls this doomed couple. I would love to hear your opinions on this film if you have seen it; I love it and the music stirs me with its melancholy.