Passengers looked on in shock and embarrassment as the half-naked woman bounced up and down on her lover’s lap with her breasts exposed.
Witnesses say the shameless pair boarded the number 149 service in Shoreditch, east London, around 2am yesterday.
They romped all the way to Stoke Newington and through Stamford Hill, north London.
One traveller, 27, said the man was laughing and gesticulating to other people.
A pic from the scene shows the man flashing a devil sign with his fingers at the camera.
He said: “A few people were looking at them but he was laughing and saluting everyone while she was making noises.”
Two randy revellers were filmed having sex on a nightclub sofa in front of other clubbers.
“It’s an unbelievable place to have sex”
“When they got on they were already all over each other,” he continued.
“I guess he couldn’t wait until he got home – maybe he still lives with his mum.”
The couple, who are believed to be in their mid-20s, were ordered off the bus in Harringay by the furious bus driver.
The witness, from east London, added: “People around them weren’t really saying anything – that’s what was funny. Everyone was being polite.”
Another passenger told the Sun: “It’s an unbelievable place to have sex.
“The top deck of a London bus to Edmonton is not exactly the most romantic place in the world.”
Cheeky girls – who try to spice up shopping trips for their fellas by flashing – have posted their bare-all snaps on the Internet
There have been numerous incidents of Brits having sex in public.
Daniella Hirst and Craig Smith – who said “one thing led to another” – were caught on CCTV having sex at Domino’s in Scarborough earlier this year.
While another lad confessed to brazenly romping with a mystery red-head at Hackney Fields station in east London.