Lost in translation

I've learned that you can't always translate something based on logic. Our German teacher told us a funny story this morning. One of her students (obviously not a native German speaker) was shopping at a butcher shop and asked for Wurst ohne Preservative, because she wanted to buy sausages that were not made with preservatives. Little did she know that Preservative actually means condom in German. Only later, after asking our German teacher for clarification, did she understand why everyone at the butcher shop was chuckling upon hearing her request.