A sex tape involving UFC legend Randy Couture has leaked online.

In the video, Couture holds a camera in one hand and pleasures himself with his other. No one else appears in the video, which is being featured on popular porn-tube sites, according to MMAWeekly.

In the video, Couture’s distinct rib tattoo is distinguishable.

Couture, 55, retired from the UFC in 2011 and was the fourth person inducted into the UFC Hall of Fame.

During his over decade-long career, “The Natural” earned a 19-11 record and won both the light heavyweight and heavyweight belts. He also competed in 16 championship fights.

After getting out of the fight game, Couture successfully transitioned to Hollywood where he starred in the first three instalments of the “Expendables” series alongside Sylvester Stallone, Jason Statham and “Stone Cold” Steve Austin.

It has not been a good few weeks for UFC legends.

Just last week American champion Chuck Liddell was famously knocked out by Tito Ortiz in a farcical Golden Boy MMA fighting event.

UFC boss Dana White labelled the fight “disgusting”.

The fight was the third in the legendary fighters’ trilogy after they had previously fought in 2004 and 2006.

The match lasted just four minutes and 24 seconds, with the 43-year-old Ortiz scoring a knockout win over his 48-year-old opponent.

In promotion for the bout, De la Hoya billed the fight as Liddell’s opportunity to choose when to retire, and took aim at the UFC’s pay structure.

“I heard last week, the cokehead, Oscar De La Weirdo, is talking s*** that I don’t have any place to tell guys when to retire,” White fumed on the UFC Unfiltered podcast.

“First of all, it’s called friendship, you f***ing cokehead.

“I’ve been friends with Chuck Liddell for 20 years, and the reality is that Chuck Liddell retired when he should have retired — eight, nine years ago, however long it was — and Chuck Liddell’s almost 50 years old and has no business fighting any more. And the fact that the state of California even let that fight happen is disgusting — disgusting.”