A randy couple were filmed enjoying the "ride" of their lives while allegedly having sex on a bus, with the woman "vigorously" gyrating now seen nearly half a million times since the video was uploaded to social media.

The pair were spotted romping on the back of the number 135 bus as it roared down Bury Old Road in Prestwich, Manchester, on Tuesday afternoon.

In the video, filmed by gas engineer John Dolan, a woman can be seen bouncing up and down on the lap of a man sat on the backseat of the top deck.

John, who was sat in his van waiting for pals, said he "noticed movement" in the corner of his eye and quickly filmed the alleged sex act before sending it to his wife.

The woman was seen bouncing up and down on a bloke's lap
The woman was seen bouncing up and down on a bloke's lap

After realising the bus was heading in the direction of a local secondary school, he decided to post the video online.

The post has since attracted more than 460,000 views – with social media users outraged by the reckless exhibitionists.

John from Manchester, said: "It was mad, very strange. It's just wrong. It looked quite vigorous.

"They slowed down a bit when the bus stopped but were still at it, then carried on again as it pulled off.

"I can't imagine if an old lady got on the bus and saw them. She'd probably have a heart attack.

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"I just hope they're a couple and not doing it on the sly because now they've gone viral."

When John sent the video to his wife, she commented on how "disgusting" the lovers were.

Explaining the bizarre moment he spotted the couple, John said: "The bus pulled in at the bus stop and I looked up from my phone because I saw movement and thought 'what's going on there?'

"There was another woman crossing the road at the time with a smirk on her face.

The action was spotted by John when he 'noticed movement'
The action was spotted by John when he 'noticed movement'

"She must have seen it because she looked a bit embarrassed.

"It's funny the bus driver didn't spot them in his mirror or on CCTV.

"There are kids on that road. There's a high school about a minute down the road and it was heading in that direction.

"I sent the video to my wife and she said 'that's disgusting'.

"Obviously I'm a lad and I find it funny."

Daily Star Online has contacted Go North West for comment.