VIEWERS of Channel 4's controversial documentary Mums Make Porn were left questioning the whole point of the series last night after spotting a fatal flaw in the show.

Five women, who all have teenagers, originally teamed up to plan their own erotic flick after being left horrified by the hardcore porn available online for free.

15 The final episode of Mums Make Porn saw the women produce and showcase their 12 minute film Credit: Channel 4

In the third and final episode of the Channel 4 show the women had to go about recording their own ‘safe for teens’ porn film and were finally able to showcase their hard work, to their own adolescent brood.

However, viewers were quick to point out that everything they were hoping to include in their film had already been done by a previous director during last week’s episode.

Fans rushed to social media to question the point of the show when the adult content is already out there to view.

"Emma's daughter hit the nail on the head - its already out there... its just f****g boring # mumsmakeporn", one viewer wrote.

These mums have a challenge on their hands.

I am pretty sure that every type of possible porn film already exists. They won't actually be making anything new, I don't think.#MumsMakePorn — Sarah Myers | Writer and Poet (@TaysunBerry) April 3, 2019

While others added: "Safe sex? Diversity? Different body types? A bit of fun? I can promise you that you'll find that on most porn websites too."

And: "These mums have a challenge on their hands. I am pretty sure that every type of possible porn film already exists. They won't actually be making anything new, I don't think. # MumsMakePorn."

Safe sex? Diversity? Different body types? A bit of fun? I can promise you that you'll find that on most porn websites too 🙄 #MumsMakePorn — Slainee Doyle (@slaineedoyle) April 3, 2019

And while the youngsters seem to be proud of their mums’ efforts, viewers at home were also left horrified at the prospect of having to watch an ex-rated flick with their parents taking to Twitter to share their thoughts.

One tweeted: “Never mind what your kids are watching online… Imagine knowing ur f***ing mum has done this.”

Agreeing another added: “Imagine being one of their kids. Fml you’d never leave your gaff again would ya?! How embarrassing”

15 15 15 15 Credit: Twitter 15

15 Viewers admitted to feeling very sorry for the mums' teenage children who had to watch the film alongside them

A third confessed: “I wouldn’t go back to school if my mum went on #MumsMakePorn”

However, some viewers had a more positive outtake, taking to social media to applaud the women’s efforts.

In one tweet a viewer said: “Last episode of ‘Mums Make Porn’ tonight. I’ll actually be quite miffed when this is over to be honest. I’ve found it rather entertaining.”

The final instalment saw the women piece together their film Four Play before showcasing it at a premiere attended by their children, parents and industry experts.

The mums down to four as last week saw Malaysian-born Christian Jane 43, drop out of the project all together after the process left her ‘troubled.’

15 The mums could be seen acting out the scenes ahead of the final production Credit: Channel 4

15 The mums selected size 20 adult performer Heidi to star in the piece Credit: Channel 4

Sarah Louise books size 20 adult performer Heidi for the shoot as she is keen to cast a fuller figure actress.

She explains: "I think there are major hang ups with teenagers with their bodies, they're seeing these bodies on these porn films and they're not real.

“My daughter had anorexia for a while. I had a gastric balloon fitted shortly before Ella then got anorexic” breaking down she adds “That’s not giving the right message, I was only a size 16.”

One of the biggest challenges that the mums face is finding a location to shoot the film as not many proprietors were the idea of their property being used for porn.

15 The first half of the film Four Play sees Heidi and fellow actress Katana perform a lesbian love scene Credit: Channel 4

15 Emma was left comforting Sarah Louise after she disagreed on the direction of the film Credit: Channel 4

However, they finally find a warehouse in South East London willing to allow them to film there.

The film consists of two parts, a girl on girl scene using Heidi and another actress Katana as well as a straight segment with Romeo and Daisy.

The mums ask the performers to be vocal about their desires throughout the scene to demonstrate consent and include shots of a condom being opened.

But following the lesbian love scene Sarah Louise admits she isn’t “feeling any magic yet” leading to a clash between her and Anita who was directing the scene.

Comforted by Emma Sarah Louise explains: “I want it to be good I want it to be really really really good.”

But after some artistic differences the ladies call it a wrap after ten hours of filming with Anita exclaiming “we've directed a porn film that's going to challenge the industry.”

15 The mums were eager for the actors to express their desires to document consent in the film Credit: Channel 4

15 After ten hours of filming they were finally happy with the completed film Credit: Channel 4

At the screening Emma’s two daughters Olivia, 18 and Alice, 20 are among the teens to view their mums erotic film.

Olivia said: “It’s a bit weird being at a screening of a porn film that your mum has made.”

But a proud Alice adds: “I think they did exactly what they set out to do.”

And it wasn’t just their family who approved with their mentor and fellow adult film producer Erika Lust agreeing to distribute the final 12 minute cut.

15 At the screening Emma's two teenage daughters spoke about their pride over their mum Credit: Channel 4

15 The women said they believed they had created a film to challenge industry standards Credit: Channel 4

Erika says: “It was so much emotion and feeling. What you wanted is there it's up on the screen.”

The mums were brought together by Channel 4 to write, cast and direct the adult film.

They were left completely in control – from writing and casting, to directing and editing their fully mum-approved pornographic film.

Food stylist Emma is art director, while Sarah-Louise is in charge of the hair, make-up and costumes.

Anita and Sarah share the director role, with Sarah also acting as the on-set photographer.

Stats commissioned by the NSPCC suggest the majority of children have been exposed to pornography by their early teens.

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Around 65 per cent of 15- to 16-year-olds report having seeing pornography, as did 28 per cent of 11- to 12-year-olds.

You can catch up on the series on All4 now.

Elsewhere Julia Bradbury fared she couldn’t have kids after endometriosis diagnosis – and says her only symptoms were feeling ‘a bit moody’ and ‘heavy periods’.

And a single mum was left sobbing when her 13-year-old son saved up his pocket money to buy her a new car.