You tube has security filter that once activated it will block out most objectionable videos.
To activate the security filter follow these steps:
1. Log in to YouTube with your Google account.
( Login in with Google account stops other people from changing the Security Filter setting on this browser. Once the security filters safety mode is set up, it will remain on, even after you have signed out of YouTube. )
2. Scroll down all the way to the bottom of the page.
3. Click the link ‘Safety: Off'
4. Choose ‘Safety On’ and ‘Lock safe mode on this browser’ and click ‘Save‘.
Now you have successfully set up and locked safety mode for YouTube on your web browser.