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I wisened up and translated my keywords into German (Deutsch) and did a google search. Die Heilige Hure (1997) was the first ever match. And the story seems to fit too. See below for a translation of the story. Now we only have the problem of finding this movie. I must have watched it in RTL when I was young. I am open to suggestions.
Story (google translated):
The holy whore is a German television film from 1998. The melodrama is a literary adaptation of the novel The holy whore: "Creed in God and his flesh" by Heide-Marie Emmermann.
contents
1 action
2 criticism
3 publication
4 web links
5 individual records
action
Dr. Marie Steiner is an up-and-coming lecturer in theology and is annoyed with the fact that she is not allowed to hold priesthood in the Church as a woman. She herself researches the connection between sexuality and the Bible, so that she keeps bumping into her colleagues, which is why her upcoming professorship is at risk. Through her studies, she maintains some contacts with the BDSM scene and learns at the same time, since she always has an open ear for her students and others, that the young student Gudrun was pregnant by a priest, but not by whom. She also advises homosexual Uli Schneider, one of her students who is about to be ordained a priest, to choose love and not necessarily priesthood. Since this triggers an inner conflict in him, which drives him to suicide, his death Steiner is accused of her colleagues.
At the same time, Marie also gets to know art restorer Paul Gruber, who is skeptical about Jesus and comes closer to her. He scourges the Church's hypocrisy and lack of love. He kisses Marie and they both have sex that is so violent that Marie wears several cuts and wounds. This confuses Marie, wondering why she feels intense love despite the pain. Later she spends a whole weekend of sex with him, during which Paul confesses his jealousy because she doesn't love him as much as she loves Jesus. Since he wants to own her, however, he tattoos her butt. This encourages her so much that she goes on a trip to the red light district with her students to visit Domina Carola. At the same time, Stefan is already intriguing so that he himself and not Marie becomes a professor. When Stefan also discovers the BDSM actions between Gruber and Marie, he wants to confront Gruber. But there is a fight between the two, which Gruber can decide for himself, but still makes the decision to separate from Marie.
Marie cannot leave Gruber, however, so she visits him at night and is startled to find that he is a family man with wife and child. This will destroy your illusion of love, truth and Gruber. In her distress she visits Carola, who explains her own worldview. All men are liars and salvation can only be experienced through punishment. As an illustrative example, Marie may whip a BDSM customer, imagining that it is Gruber. This is obviously good for her, which is why she wants to reconcile herself with Gruber. But this rejects them. Meanwhile, she is finally betrayed by Stefan, so that he is ultimately appointed professor himself. Marie not only learns that Gudrun died trying to have an abortion, but also that Stefan was the child's father. She is angry that only men can be priests in the Church, even though they are all just lying. When she also learns that Gruber beats his wife, it is finally enough for her.
Marie visits Gruber and identifies herself as a dominatrix. He is excited. But when she whips him and forces him to lick her boots, he realizes that she only came to humiliate him for the beatings on his wife. His wife appears in the same room and Marie gives her power so that Gruber will never hit her again. Henceforth she feels like a servant of God. When Stefan's inaugural speech is to be given during the Pope's visit, Stefan is so moved by his feelings of guilt that he publicly admits his relationship with Gudrun and his intrigues towards Marie. He begins to whip himself. Marie runs into his pulpit, stops him and protects him. With this deed everyone realizes that Marie has a good soul and can be forgiven.
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Nope, this wasn't porn. At most an erotic thriller. 
