iTunes has parental controls in iTunes preferences that allow you to set content restrictions.

Read more:
iTunes: Using Parental Controls

Similar Posts:

• Windows OS Managed Client: How to manage iTunes control features
• iPhone 3.0 Parental Controls Now Allows for Explicit Content on App Store
• Can’t manually add location data to photos in some cases
• iTunes: About iTunes Store Parental Advisories
• Mac OS X v10.5, Mac OS X Server v10.5: Web, Mail, Wiki, Personal Web Sharing, Parental Controls services may not start after restoring a Time Machine…