Georgiana had the highest opinion in the world of Elizabeth; though at first she often listened with an astonishment bordering on alarm at her lively, sportive, manner of talking to her brother. He, who had always inspired in herself a respect which almost overcame her affection, she now saw the object of open pleasantry. Her mind received knowledge which had never before fallen in her way. By Elizabeth’s instructions, she began to comprehend that a woman may take liberties with her husband, which a brother will not always allow in a sister more than ten years younger than himself.

– Jane Austen

Pride and Prejudice, Chapter 61. After their marriage Elizabeth doesn’t waste any time in educating Darcy in how to enjoy being laughed at. And she has a very willing pupil in Darcy’s younger sister Georgiana, who learns that a wife can take liberties with her husband that a younger sister cannot.