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Naked men have been spotted tied to trees in a picnic area popular with young families in Prime Minister Theresa May's constituency.

Cross-dressing men have also been seen getting out of vans at the National Trust site, while dog walkers have stumbled across condoms.

The discoveries have sparked fresh calls for police to investigate the woodland area in Maidenhead - which is known to be a dogging hotspot.

Parents and walkers near the site have taken to social media to complain about some visitors' behaviour, deeming it 'unacceptable'.

The spot at Maidenhead Thicket - which features two picnic tables - has been ranked four out of five stars by a gay cruising website.

(Image: Getty)

The website describes it as: "A rather overgrown picnic area with two picnic tables (not on the tables, please) with quite a few secluded, wooded, bushy areas to go."

It adds: "There is also a wood behind for serious business (groups, gang bang, or 1-2-1)."

The website says the area is wheelchair accessible, but users should wear long-sleeved clothes to avoid getting scratched by brambles.

It also warns doggers that police patrol the area.

"If you don't know now, you'll never know..." an editor for the website writes.

"Multiple cruisers report gangs of youth wielding baseball bats and metal bars, destroying cars and chasing people.

"Take care of yourselves and each other, and keep cruisein'!"

The area is in the heart of Mrs May's Maidenhead constituency in Berkshire, which she has held for the Conservative party since 1997.

A dog walker, who did not wish to give her name, complained: "It is unacceptable. Lots of dog walkers visit the area and parents with young children.

(Image: Barry Clack)

"One woman saw two men jump into a van in the car park which had a child's seat in the back and I have seen the same man come out the woods dressed as a woman on two occasions.

"They should install cameras in the car park. If more people report it then the police will be able to patrol more."

Local councillor Simon Werner said: "When I take my daughter blackberry picking we have to avoid the woodland area...you would certainly get more than a blackberry there."

Mr Werner, councillor for Pinkneys Green in Maidenhead, added: "I will be raising the issue with the Chief Constable of Thames Valley Police in a public meeting in the town hall next month.

"It is vital people phone the police to complain about it and email me."

Car parks in Henley Road and Pinkneys Drive at Maidenhead Thicket were among a host of areas featured on cruisinggays.co.uk.

Rachel Rosyth, lead ranger for the National Trust, which owns the site, said: "We are aware of some anti-social behaviour at one of our car parks and are looking at ways to prevent this. We encourage witnesses to contact the police immediately.

"There is regular work to clear litter and cut back vegetation in car parks and gathering points.

"We urge visitors to respect the environment and the rights of other law-abiding users to enjoy the site and continue to work with the police and the Royal Borough to do all we can to tackle this issue."

A spokesman for Thames Valley Police said dogging was not a crime, but performing sex acts in public was an 'enraging public decency' matter under common law.

Officers had not received specific reports of dogging and were today urging people with concerns or information over anti-social behaviour in the area to raise them with the force.