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A mum was left baffled by a children's book she found in a doctor's waiting room containing bizarre explanations and diagrams of clowns demonstrating sexual positions.

The book 'Mummy Laid an Egg!' by Babette Cole starts off 'innocent enough' before taking 'a very surprising twist'.

Sharing images of the book on Facebook , Katherine Peck wanted other parents to experience what she branded the 'child-friendly Kama Sutra guide' - and it left thousands questioning its content.

By page six, readers are introduced to simplified drawings of genitalia, with an arrow from the penis to the vagina explaining 'this fits in here'.

It explains: "Daddy also has a tube. The seeds from the pods come out of it. The tube goes into mummy's tummy through a little hole. Then the seeds swim inside using their tails."

(Image: Facebook / Katherine Peck) (Image: Facebook / Katherine Peck)

It then moves on to provide examples of the ways in which people have sex, showing a couple flying along on a skateboard and - everyone's favourite - someone doing a headstand while another balances horizontally on top of them holding a colourful umbrella and spinning a ball on their finger. Oh, and both are wearing clown hats and noses.

There's also people doing it floating mid-air using balloons like a raunchy version of Up, and two using a space hopper - which is just impressive.

The mum-of-three describes this section as 'aerial acrobatics, fetish clown outfits and space hoppers' before it progresses through some other baby-making processes.

A sperm is depicted winning the race to the egg, as others head off with their tails between their legs, claiming 'we was robbed'.

A very relaxed mum is shown giving birth to her child, who joyfully pops out to politely greet their parent.

The mum who shared her find said the book left her with 'four billion questions I hadn't planned answering today', as the post recently resurfaced, racking up 85,000 shares and 71,000 comments.

One commented: "Usually I find myself being super quick with my witty responses, but I've been sitting here for a few minutes and I have nothing."

A second said: "Can you get me a copy? Been doing it wrong for years."

A third replied: "Perfectly explained! What a lovely children's book. Amazing author and even better illustrator! Bravo."