Great question — answering as the UphillTech team:
Sounds like George C. Scott's Hardcore , (1979), though he played a businessman, not a Reverend, and his daughter was making porn films, not being a prostitute. Jake Van Dorn is a businessman from the American heartland who shares strong Calvinist convictions with most of his countrymen. His teenage daughter is missing from her church youth convention trip to California and Van Dorn hires a private investigator to find her. The result of the investigation is his daughter is spotted in a cheap X-rated movie. Van Dorn decides to bring her back personally and during the quest he becomes familiar with the pornographic underworld.
Full answer by Will Feldman: https://movies.stackexchange.com/a/27976 (CC BY-SA 3.0).
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