Gosh, yes, I remember that thread. And the panic of thinking I'd accidentally posted something private on the public board because the inbox looked exactly the same as the messageboard.
To avoid those pesky PPM messages, you have to set your own filter to smutty. If an innocent word contains 'c*ck' as a component, for example, the forum software thinks 'Oo-er, missus', and won't allow it, even though you only said you worked in a branch of Peac*cks. And so on with a variety of parts of the body. It's like a Victorian maiden aunt. I can provide you with an extensive list, but it will be full of asterisks.
PLEASE, don't encourage Mr D's attempts at poetry. It can only lead to tears (mine).