Three siblings were shocked while on a night-time Pokemon Go hunt on Blackheath Common when they discovered a couple appearing to have sex.

Lauren Dua, 24, brother Lewis Overell, 20, and 14-year-old sister Libby Munday had been playing the smash-hit app at about 11pm on Saturday, August 20.

The trio, who live nearby, came across a man dressed in just a silver shirt and blue Y-fronts lying on top of a woman who appeared to be completely naked.

Lauren said the pair were not put off by a gathering crowd and carried on regardless.

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Photo: Mercury Press

She said: "We were just walking across Blackheath Common when my brother said 'is that woman naked over there?' and I thought he was joking but then my sister said the same thing.

"So I went over to have a look and could not believe that they were right and by that point a few people had gathered around still playing Pokemon and they were putting on quite a show.

"The couple really did not seem to be bothered at all that everyone was stood around watching them."

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Photo: Mercury Press

After the X-rated scene carried on for a while, an onlooker allegedly took offence, resulting in a scuffle.

Lauren claims the semi-clothed man, in his mid-40s, was assaulted and police were called.

The beauty therapist posted her snaps online where they were shared more than 2,500 times before being deleted for being too raunchy.

She said: "I couldn't believe it was real life - I only went out to catch a Charmander - so it was a pretty weird night in the end.

"They could have found a bush or something to cover up because it is a built-up area and there were plenty of people about.

"We often go out at that time around there for a Pokemon hunt but I've never seen anything like that before.”

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Lauren with her siblings Libby and Lewis. Photo: Mercury Press

The Metropolitan Police have confirmed they are investigating the incident.

A spokesman said: "Police were called out at 12.11am on August 21 to reports of an assault on Blackheath Common.

"A man in his mid-40s suffered facial injuries at the scene that are not believed to be life-changing or life-threatening.

"There have been no arrests at this time and investigations continue."