And you should probably restrict it.
We have no control over the content of these sites.
Seems to be a new thing here in the Netherlands.
To stop that, Youtube has a system that scans every upload for nudity and copyright infringement.
One of the videos even encourages men to blackmail women for sex! Children will still see the videos.
All links, videos and images are provided by 3rd parties.
Children will still see the videos.