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Shocking footage has emerged which appears to show people having sex on a sofa inside a popular Cardiff nightclub.

The incident was filmed by a woman out celebrating a friend's 21st birthday in Revolution on Castle Street on Saturday night.

She posted the clip to Twitter, saying "When you go to revs you always get more than what you paid for."

The video is captioned "Vile humans".

The video shows the woman with her dress raised above her waist and her underwear showing as she moves back and forth while sitting on the man. The video does not show clearly whether they are actually having sex.

The person who filmed it said: "It went on for at least five minutes and there must have been 25 people watching.

"One girl said 'Shall I stop them?' She tapped the girl on the shoulder and said there are all of these people watching, but she just carried on.

"So someone just pulled the girl off eventually.

"The bouncers did arrive but I think the pair just scarpered and left before they could catch them."

She said the incident took place at around 1am on Sunday morning.

She said: "I was quite drunk at the time but seeing that definitely sobered me up."

A person who answered at Cardiff's Revolution declined to comment.

The clip of the incident on Twitter has been shared more than 740 times and liked more than 1,300 times.