Around 30 per cent of all internet traffic is pornography, and the biggest porn site gets over four billion page views and 350 million unique visits per month, a study has found.
The ExtremeTech website said the only other websites that surpass this figure in size are Google and Facebook, the Daily Mail reported.
The report uncovered the viewing figures for porn website Xvideos from Google's DoubleClick Ad Planner, which uses cookies to gather information about users.
It also used actual data from the second biggest porn site, YouPorn, to check how much data is being transferred out of the website's servers.
The average length of time spent on Xvideos was 15 minutes. Around 29 petabytes a month, or 50 gigabytes per second, of pornography is being transferred.
The YouPorn website hosts over 100TB of porn, gets 100 million page views and transfers 950 terabytes per day.
Earlier this year, over 6,400 passwords and emails of YouPorn users were hacked and details revealed online.