HBO GO has Parental Controls that allow the account holder to restrict content based on TV and movie ratings. In order to setup the Parental Controls, go to the “Settings” section then "Parental Controls" and follow the steps below based on your device to choose a rating and create a PIN:
HBO GO Website:
Click on "Setup Parental Controls", enter a 4 digit PIN and save. Next, select the desired rating level to restrict and save.
Click on the edit icon and select your rating from the drop down menu. Enter your PIN and save.
Under My Account, Click on Configure under Parental Control, enter a 4 digit PIN and enter. Next, select the desired rating level to restrict and click on configure PIN.