Il commissario Pepe (1969)

A police commissioner in a little town in the Italian Venetian province investigates a prostitution ring run by two pensioners; during his investigations he also learns that a former manicurist shacks up with ten students, the prefect's daughter prostitutes to keep her pimp, a famous doctor has sex with his young patients, a headmaster has his eyes on the pupils, a noblewoman organizes orgies in her villa, the local convent is run by a lesbian and his actual girlfriend poses for a hardcore magazine. He wants everything to come out in the open but his superiors try to put obstacles in his way.