R rated movies, M rated video games, etc...

[splashpot]

For those of you with young children, at what age do you feel it's ok to let your kids see and play whatever movies and video games he wants? How much does the content matter to you? How much research do you do if your child wants to see a potentially violent or sexual movie? Is nudity worse than violence?

I know it all depends on the content of the movie and maturity of the child, but I thought it would be interesting to see a poll for mature content in general