What most people do not realize is that when curse words were invented there was more thought put into making them then assumed. While each individual letter of curse words are not hard to pronounce, the combined letters make some of the hardest to say words known to mankind. To illustrate my point, try repeatedly saying some profanity now. You may note that you have slightly more difficulty getting yourself to say these words then you have with others. Most people merely associate this difficulty with their own conscience trying to inhibit them from saying the words. However, the problem is a physical not moral dilemma. Most speakers also have trouble sounding out profanity. If the speaker and/or the downloaded MP3 is of low quality, then the speaker will not be able to sound out the swearing. The speaker will then simply skip over the segment of the song containing the word, or be forced to make a small bleeping noise in its place. Your problem is therefore most likely in your speaker, not the downloaded song.