I figured nobody teaches real swear-words. Level 1 is for everyone, it does not contain any rudeness. Level 2 and especially Level 3 are extremely rude. Please bear in mind that the translations are not perfect, because it is impossible to translate most of them. The expressions at Level 1 are interchangable. There is an audio recording to every expression (native speaker).
Please DO NOT TAKE this course if you are UNER 18 YEARS!