Just to point out that Medieval and pre-Medieval swearing existed, it just doesn't occur to us now because it was so rarely written down as it was used. Chaucer's Canterbury Tales are noted for the profanities used throughout, the whole book often reads like a modern film script and is bawdy enough to be a Carry On film. The 1382 Wycliffite bible (of all things) similarly contains plenty of words that were either just about on the edge of respectability or were obviously profane.
Shakespeare was hardly going to litter his verses with base profanities given the issues that playwrights already had with contemporary censors, and he was never going to have a character tell another to 'Fuck Off' when the play might be attended by nobility or even royalty.
