For all parents who have provided their children with an iPhone, an iPod or an iPod and are concerned about what they watch on it, well, there is something you can do.
Blue Coat Systems have produce a browser (K9 Web Protection Browser) that allows you to set appropriate age based restrictions. The browser replaces the internet browser that comes with the device, becoming the default browser. As you set it up as the administrator under a password you can check the history of web pages downloaded as you wish. It clears the history every seven days so there is always a trail on the device.
The browser is available for download on the Apple Apps store for free.
It is a good app. I use it on my iPad.