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A woman who caught a young couple having "wild sex" in a park full of hundreds of people - including her 10-year-old son - says it was the lewdest thing she has ever seen.
The pair, in their 20s, twice had to be separated by police after they refused to stop romping in sunny George Green, in Wanstead, on Tuesday evening.
One eyewitness said the pair were performing a "full-on porn movie", while a local councillor said "the sounds of sex" were audible from a distance.
Jo Brooks, 40, was walking her dog through the popular park with her young son when she spotted the couple on one of the benches.
She said: "At first I just thought 'surely they aren't doing what I think they're doing'. Then as I got closer I could see the girl was lying back on the bench and the man had his trousers around his ankles. It was wild sex.
"My dog was pulling us towards the bench, and he's a British bulldog so I couldn't just walk the other way."
As the mum-of-two got closer she said the woman leaned forward and began performing a sex act on the man.
"I just started shouting 'stop! What do you think you're doing?" she said.
The couple completely ignored Mrs Brooks' pleas and adopted another sex position before continuing their outrageous antics.
She said: "They both just looked at me like 'what are you going to do?' It was disgusting, I couldn't believe it.
"It's the lewdest thing I've ever seen in public. There were children around and the park was absolutely packed. There were people everywhere.
"They looked like a normal, presentable couple. They were stumbling around a bit and were definitely under the influence of something, whether it was drink or drugs."
The couple began to put their clothes back on before two police officers arrived in the area - but they failed to arrest the pair.
Mrs Brooks, who works in the City, said she was amazed the officers didn't detain them, especially when they revealed they had moved them on earlier in the evening.
She said: "Their reaction was just 'oh yea we moved them on before'. I couldn't believe it. At what point did it become legal to have full-on sex in front of children in a public park?"
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The mum-of two later had to explain to her son what the couple were doing after he began asking questions about the lewd incident.
She said: "People can have a laugh about it but they didn't have to sit down with my ten-year-old boy and explain what they were up to.
"He was very embarrassed about the situation and found it all very awkward. Bless him though, at the time I think he was more worried I was going to get into a row with these two."
The couple had earlier "stopped traffic" as they began their sexual encounter next to a main road in another part of the park.
Mrs Brooks said a friend who saw the first incident told her cars were slowing down to gawp at the pair as they made love.
A 39-year-old mother-of-three who witnessed the sordid scenario said: "I have seen a lot in my time but I am genuinely shocked at what I saw.
"It was a full-on porn movie in Wanstead.
"Police walked up to the woman and she stood up with no knickers on and her cleavage hanging out."
Conservative councillor for Redbridge Colin Cronin described it as a "sizzling" night.
He tweeted: "Metropolitan Police have had to break up a couple in flagrante in the middle of George Green just now."
A Met Police spokesperson said: "Police were called to George Green, Wanstead, on Tuesday at about 7.20pm to reports of couple engaged in sexual activity.
"Officers spoke to the man and woman at the scene and they were asked to leave the area.
"Officers remained in the area for a time afterwards and conducted patrols.
"The local policing team is aware of the incident and will be making further enquiries and speaking to local people."