The stated purpose of the "R" rating for films is to shield youngsters from material that is unsuitable for their age. Neil Postman, in The Disappearance of Childhood, notes that unrestricted access to sexuality by children and adolescents blurs the line between kids and adults, and may irreparably damage children in the process. Some may argue that what is on the screen is no different than the material these kids are exposed to on cable television -- but that begs the question: Should children be exposed to a mechanistic view of sex before they are of an age to discern its moral quality? Read More.
Good point, it does seem that there is an intentionality in what the movies are showing. If a directors worldview is based on a value less model they will try to propogate there viewpoint. Movies are like most forms of communication, influenced by the worldview of it's creator.