It makes absolutely no sense for there to be radio edits and blanket bans on explicit songs receiving air time. Music is the only form of communication that receives blanket bans by the FCC in this manner. TV shows and movies get different ratings, and as long as there is an appropriate warning label, it can show anything short of pornography. The moment a musician says any word worse than "damn," whether drug-related or a simple curse word, it's considered to be "explicit content" and they get censored and/or banned from the air. A radio station should be able to say, "we're going to play an explicit content song, so if you don't want to hear it, change the station." It's honestly ridiculous that such puritanical regulations are placed on a single industry.
/rant
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I only listen to xm sirius radio, and songs are still edited. Unless its on the xl stations. But some people might not care to listen to foul language on the radio and/or have children that they may not want exposed to it. Plus some edited or radio edits sound better than the original.