Content Rating for Android Market

In the coming few weeks, Android Market developers are going to be responsible for their applications content, because Google is going to introduce a mandatory content rating system for all
applications in the Android Market. This new system will include the same four
level content rating for All,  Pre-teen, Teen, and Mature. In this way,
users will be helped to choose the most suitable application for them
considering application's category. Any application or game that will not include
this rating will be treated as “Mature”.

For more details about rating levels, go here http://market.android.com/support/bin/answer.py?answer=188189