The prison officer filmed having sex with an inmate in his prison cell is a swinger who appeared on a Channel Four documentary about threesomes and orgies, MailOnline can reveal.

Linda De Sousa Abreu, 31, faces a police investigation after she was recorded romping with a prisoner at HMP Wandsworth.

She is understood to have recently quit her job as a prison officer in the South London jail following the scandal.

Her sister, Andreina, told tonight how she warned her not to mix her lifestyle with her work and said she was now 'suffering the consequences'.

She said Linda and her husband Nathan were stars of Channel 4's Open House: The Great Sex Experiment in which couples pushed the boundaries of their relationships at a luxury country escape. It was shown last year.

And her sibling, who is a personal trainer from London, told MailOnline tonight how she had to block fans of her sister from her own social media after the racy show. Linda is also believed to have an explicit OnlyFans account.

Andreina said: 'She's a swinger. She was on a Channel Four programme called Open House. I never saw it. It's not the sort of thing I'd watch with my little sister in.

'I have built up a big community on my own social media – I preach fitness and God – but when her fans found her, they found me and they were sending me messages and I was blocking everyone because it's not something I wanted to be associated with.'

Linda's OnlyFans reads: 'I am a happily married sexy latina who wants to share hot content with you. Experience my real life, real love, real sex and real orgasms!

'We believe in authenticity, all our content will be genuine and we'll never fake it because we want you to enjoy watching it as much as we'll enjoy making it!'

Her sister said she only found out Linda worked for the prison service at the start of the year and said the pair had a heart to heart.

She explained: 'I've had my say with her, I was very brutally honest with her about her behaviours. I spoke to her previously about her lifestyle.

'All I can say is that I'm a firm believer in God and Linda gave herself to the wrong lifestyle, 100 per cent, and now she's suffering the consequences unfortunately, which has fallen down on her husband, our parents and myself.

'I don't have anything bad to say about my sister besides the fact that I was wary of the lifestyle she was leading and I knew it was going to lead her down a very horrible path, which I warned her about.

'As her older sister, the only blame I have is that I should have been more thorough, I should have been harsher, but then again everyone chooses their own path.

'I only found out that she worked for the prison service in January. That's when I spoke to her and said do not mix your lifestyle with work. Don't be stupid, don't do stupid things.'

Linda is seen wearing a uniform during the explicit clip, which begins with her performing a sex act on an unidentified prisoner at the Category A jail in south-west London. 

The footage, which MailOnline understands to be recent, then shows her having sex with the prisoner while his cellmate films on a mobile phone. Footage of the cell shows a TV and piles of clothes heaped over a bunk bed. 

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Calls for Wandsworth Prison to be placed into emergency measures amid concerns over security, overcrowding and drug use 

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The friend who is smoking while recording says: 'Guys we've made history, this is what I'm telling you.' 

The prison officer's radio, left on a side table, crackles constantly with her colleagues heard on the other channels above the din of the other prisoners on the landing unaware of what is going on in the cell.

At one point, someone appears to try to come into the cell, at which the man filming, can be heard saying to the person on the other side of the door 'give me a minute, one second.'

The prisoner filming tells his friend to carry on and then pans the camera round momentarily and, grinning, says: 'This is how we roll in Wandsworth.'

He then tells his friend having sex: 'You know you're gangster innit!'

Vanessa Frake, former head of security at Wormwood Scrubs, called the footage 'shocking'.

She told MailOnline: 'This is what is completely wrong with the prison service in this day and age! 

'This woman disgraces not only herself, the uniform and the Prison Service.'

A Prison Service spokesman said: 'Staff corruption is not tolerated and the former prison officer allegedly featured in this video has been reported to the police. 

'It would be inappropriate to comment further while they investigate.'

The Met Police said: 'We have been made aware of a video allegedly filmed inside HMP Wandsworth.

'A police investigation is underway. At this early stage, there have been no arrests. We are in close contact with the Ministry of Justice.'

Ian Acheson, a former prison governor, said the footage raised serious security concerns. 

'If this footage is authentic and I've been assured it is, the problems confronting a likely new Labour administration go far beyond overcrowding,' he told MailOnline. 

'This is a national law enforcement agency. The idea that recruits to it would even contemplate let alone participate in sex acts is a stunning indictment of the utter chaos inside this prison. It won't be an isolated incident. 

'The state is no longer in charge here. The security implications and corruption threat is obvious and as explicit as the flagrant acts. The widespread infiltration of illicit mobile phones will mean that this footage is seen by huge numbers of prisoners.

'How are decent female officers supposed to feel safe to do their jobs in an environment where colleagues willingly participate in their sexual humiliation and exploitation?'

A cell at the jail photographed during the inspection  

Two years ago a female prisoner officer faced a similar police probe over a jail sex tape.

The woman - in her 30s - was filmed performing a sex act on a male prisoner while in uniform.

More than 80 prison staff have been sacked or ­reprimanded since 2013 for having affairs with inmates, according to official statistics.

Ministry of Justice figures reveal that up until last year 59 female staff and 24 male workers were caught.

HMP Berwyn in North Wales had the worst record with 18 female staff found to have had relationships with inmates since the prison opened in 2017.

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Life inside rat-infested HMP Wandsworth amid calls for the crumbling Victorian jail to be placed into emergency measures 

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HMP Wandsworth was put into special measures after a damning report by chief inspector of prisons Charlie Taylor.

During an unannounced visit, he found eighty percent of prisoners sharing cells designed for one person, 44 percent testing positive for drugs and some going without showers for five days.

And despite the alleged escape of terror suspect Daniel Khalife last year, he said security remained a 'serious concern', with staff on the 'chaotic' wings frequently unable to accurately account for the whereabouts of their prisoners.

Built more than 170 years ago, Wandsworth is one of the oldest and most famous prisons in the country. It has had its fair share of high-profile inmates, from Oscar Wilde to, more recently, tennis star turned bankrupt Boris Becker.

In his warning to ministers calling for the category B jail to be placed in emergency measures, Mr. Taylor described an atmosphere among prisoners 'characterised by a degree of despondency that I have not come across in my time as Chief Inspector'.

He said staff are hampered by a lack of experience, poor management, and a 'poor or non-existent relationship' with prisoners.

He added that many are suffering from high levels of 'burn-out', with a third unavailable for work each day.