The Government has said a list of sex acts has been banned from online porn videos filmed in the UK in a bid to crack down on "harmful" content.
A quiet change in legislation has ruled that paid-for online porn videos must now adhere to the same rules as content produced for sex shop-type videos.
It means acts that would not be classified as an R18 rating, in line with guidelines laid out by the British Board of Film Censors (BBFC), are prohibited.
The list of around 10 acts reportedly range from spanking to strangulation.Critics argue the change not only damages the country's porn industry, with online viewers still able to access content banned in the UK by watching videos filmed abroad, but amounts to "arbitrary censorship".
The Audiovisual Media Services Regulation 2014 came in to effect on Monday.
Others have criticised the new legislation for cutting back on acts associated with women's pleasure.