There are plenty of provocative moments. There are also enough dirty jokes and bawdy allusions to bump Twelfth Night from a "PG-13" to an "R." Here's a few examples:
By my life, this is my lady's hand these be her
very C's, her U's and her T's and thus makes she her
great P's. It is, in contempt of question, her hand.
Her C's, her U's and her T's: why that? (2.5.13)
When Malvolio finds the letter Maria forged to look like it was written by Olivia, he's thrilled because he thinks he recognizes the distinctive scrawl of Olivia's handwriting. The joke here is that the prudish and clueless Malvolio spells out the word "Cut," which is slang for female genitals. (In case the audience didn't catch the joke the first time around, Sir Andrew spells it out again.) Last, but certainly not least, the reference to Olivia's "great P's" is a classic potty joke that alludes to Olivia urinating, something that would probably gross out the very uptight Malvolio.
But it becomes me well enough, does't not?
SIR TOBY BELCH