Yes, I believe that children who watch tv and listen to their parents' popular music with them (especially rap) are undoubtedly exposed to more mature content than those who do not, and it is more explicit now than it used to be.
Since there seems to be no monitoring of content on TV, we do without it in our household (it is better for her to be playing outside more, anyway). Though we home-school, it seems that my daughter encounters the pressure to conform to values that her peers are exposed to through media. It starts with consumerism and then gets worse.
We choose the movies that she watches carefully, and watch them with her. She's seen Tim Burton's "The Corpse Bride, " but did not like "Coraline," so stopped the movie for her and read more kid-friendly content to her. We've also watched the most recent version of "Charlie and the Chocolate Factory" and "Alice in Wonderland."
Because of the violence factor, I debate my 7-and-a-half-year-old daughter's readiness to watch "Star Wars" (from the 1970's and 80s, not the most recent prequilogy) He said that when he was 15, he watched it with his 4-year-old brother. Whatever his parents' motives for letting his younger brother go to that move (which I am sure was NOT rated G), I don't think should inform our reasons for exposing our daughter to it. I think that 10 should be the minimum age...and that the timing of the film's release for us (he 15 and myself 13) was the best.
We have had to prepare her for watching the movie sooner than we'd like because our neighbors let their 4-year-old son watch YouTube videos that dilute that "villain" status of Darth Vader and the Storm Troopers. Whenever my daughter wants to play a Jedi Knight, he insists she should be a Storm Trooper. She doesn't really know that real nature of those "characters" in the movie because she has not seen it, but this child's parents have shown it to her because their son watches it. :0( I've mentioned to them how we feel about it, but she has continued to be exposed to the Storm Trooper videos, so I am going to request that they not expose it to her any more. I believe that at her age, she needs to be exposed to content that has clear heros/heroines and clear villains, and the "villainous" nature of the villains should not be diluted.