Terms Good behaviour and Hanky-panky are semantically related or have opposite meaning

How are the terms Good behaviour and Hanky-panky related? Good behaviour and Hanky-panky are antonymous, they have opposite meaning.

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PDF) Adult drinks and hanky-panky. Types of metonymic motivation in English X-phemisms

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Hanky-panky synonyms - 99 Words and Phrases for Hanky-panky