In The Inklings, a fascinating 1978 book about C.S. Lewis, J.R.R. Tolkien and some of their friends, Humphrey Carpenter quotes Lewis describing his frequent evenings spent with Tolkien: "Sometimes we talk English School politics; sometimes we criticize one another's poems; other days we drift into theology or 'the state of the nation'; rarely we fly no higher than bawdy or puns."
Two things interest me about Lewis's use of the word bawdy.
First, he used it as a noun, not an adjective. I checked The Oxford English Dictionary, which includes an obscure usage of the word as a verb, meaning to make dirty or filthy or to defile. There is no mention of the word as a noun.
To Lewis and Tolkien, bawdy apparently just meant good, clean fun.