In Chinese the rudest word is the one for cunt, 'bi', first tone. Fun for foreigners new to a tonal language, as 'bi' third tone is the word for 'pen'. Beijingers say 'cao' = 'fuck' a lot, and I was pleased to find that like English you can swear anywhere in the sentence.

BTW I always remember from my days as a concrete layer hearing this immortal reponse to a question on what was wrong with our cement mixer. 'The fucking fucker's fucked' came the reply. The language of Shakespeare - not that he would have minded