You can set up Parental Controls through the Settings section so that your children do not see adult content by accident. There you will have to set a PIN (the default PIN is 1111), a time slot and an age range to limit access to content that is not suitable for their age. 

You can also do this management from your account> parental control and configure it configure it in the same way.

You can also hide these channels on your dial in this section.