It's funny how certain words are rude here but not there and vice versa.
An American might say that he fell on his "fanny," which, especially if it's a guy saying it, will get some looks from British folks. Meanwhile, Brits seem to use the word "cock" a whole lot more often than Americans; from how they use it it sounds like it's about as vulgar as saying "crap" but in the US, it usually means a penis.
What I don't get is, the condiment that Americans call ketchup is referred to as "tomato sauce" in the UK. So what do they call the stuff you put on top of your spaghetti? Certainly they don't put ketchup on spaghetti, that's horrible even by British cuisine standards.