The lyrics on rap albums and in rap music videos are sometimes a bit raunchy, especially to those not used to it or not fully aware of what kind of genre rap is. Because of this, they have created the parental advisory stickers you see on the CD cases. Rap artists realize that kids don’t need to be exposed to the sexual annotations or violent undertones in the music. Therefore, the sticker is applied to any rap music that contains things kids should not be exposed to, and most rappers will make a clean and adult version of their music so everyone can enjoy it.