The problem with Corinth was that it was a port-and-Navy town. Think of it as a Greek Phenix City or Corpus Christi before they cleaned it up. Corinth's Temple of Venus was the largest whorehouse in the Romanized Greek-speaking world, and "a girl from Corinth" was synonymous with "easy lay". The passage about love is a wonderful mix of admonishment, education and irony. Brahms set it to music from Luther's Bible near the end of his life.
Brahms: "If I Speak in Tongues of Men or Angels", Op. 121/4
The term "put a plug in it" is a little different among horse people. I've heard it expressed as, "Put a bridle on it."