What are your thoughts on the way media, television and movies are rated for the public (IE: PG, 14A, NR, Mature)?

"Media ratings have most definitely loosened over the years. I feel like what used to be rated PG-13 is now often classified as PG. I feel this is because our kids and youth are exposed to so much more now than we ever were as kids and we are becoming desensitized as a society. I do wish that some guidelines would remain tighter, especially surrounding violent content. I'm glad that a company like YouTube gives parents the ability o set up parental controls for their kids as they use the site."