Film Forum and Reviews

I know there are a few sites out there that you can go to to check out movie ratings but does anyone know off hand of one that tells you how many of a certain level of a bad work can be in a movie before it makes it another rating?How many sexual scenes and to what content etc...? I'm looking for something more then the PG is parental guidance etc...

I've heard that the panels of people rating alot of movies are just normal parents now and to some degree that bothers me.I just want to look into this further.I personally don't feel everyone has enough morals and values to be making these dicissions and I want to find a good guideline since all movies seem to be different even when the content is almost the same it may have a different rating.
Alot of movies seem to be under rated now days.Even on cars the other night I caught the "I'd give my two left lugnuts" and the rest of the statement made by mator. There was something else too I was thinking what if a kid caught that and goes around repeating that.Alot of these kids movies had things like that in.Shark Tail was another one that had a more "adult or teen" themed sunject matter in.Did anyone else notice this?