Dear iTunes Execs...no explicit rating??

Dear iTunes Execs,

I was wondering what your criteria was to mark a song "explicit" in your "explicit" and "clean" ratings that you have in your iTunes store?  Is it the words themselves, what the song means, what it represents, is it appropriate for 12 year olds???  I'd really like to know.  I don't think any of you have a 12 year old that has downloaded this IMMA BE song by the Black Eyed Peas, or you would have the word EXPLICIT next to it!  Because this morning my daughter asked me what "semen" was.  I said, "What???"  Let's just say I had to then explain exactly what that word was.  I then looked up the LYRICS to this song to see in what context it was being sung about.  Hmmmmm....  Will.I.Am is a "Banker Loaning out SEMEN??"  Oh great.  Let's explain that to our kids.  Also, I see the "F" word is on there, kinda "mispelled" there on the immabe website.  On purpose?  hmmm...and the "SH" word is on there at least 4 or 5 times.  Not to mention the "N" word many times.  SO, please explain it to me....just WHAT ELSE IS THERE????  WHAT ELSE??  I understand I was lax in not looking up the words to this before my daughter downloaded it.  I did not hear anything in the small blip you give us to listen to, and also the album itself does not have an explicit rating.  But COME ON!!  Maybe some kind of rating should be called for here??? 

Sincerely,

A Wiser Mom