YouTube has a mode called "Safety Mode", which is related to Google's SafeSearch. If your library or personal computer has this activated, you will need to manually go into the youtube video and turn off YouTube's safe search. It is a two-step process.
Step 1: Click on the title of the youtube video, so you are brought into the youtube page for the video.
Step 2: At the bottom of the youtube page, turn Safe Mode "off".