I'm cutting my own throat here, considering the content filter I "live" behind, but IMHO:

I think possibly a generic warning that contents of the forum and database are not censored, possibly in the newcomer's faq, and people are of course free to label their own contributions. However if someone starts trying to decide which lyrics are "explicit" and which are only "offensive" or "suggestive" ....

yeesh, the headache. Not to mention controversy, and disagreement.