Zimmermädchen machen es gern (1975)

Hannelore Reitzler elopes with her boyfriend to the Hotel Liebesnest but he leaves her during the night after failing to take her virginity. Not wanting to return home, Hannelore takes a job as a chambermaid at the hotel, which involves giving sexual favors to the guests at an extra charge. Meanwhile, a female cat burglar sneaks into Liebesnest every night and whenever she gets caught, she offers her body to her captors to keep them quiet.