Currently in the UK, it is illegal to share explicit sexual content without the permission of the participants in the video or pictures to cause distress (known as 'revenge porn').
You may be interested in these active petitions
However, it is not illegal for registered companies to use this content without explicit permission from the participants.
Although it's illegal for an individual to share explicit videos of a sexual nature without the subject(s) of the videos’ consent, these websites are still allowed to upload these videos, for example under a category they call "leaked sex tapes"
Companies hosting pornographic content should have to require verified consent from the subject(s) of the video before uploading the content to their websites. If individuals are held accountable in a court of law for sharing 'revenge porn', registered companies should be so also.