BLOW-UP dolls are regular guests at stag and hen dos across the country, and their appearance never fail to cause giggles.

But who were they invented by, and were they really deployed during World War II? Here's all you need to know.

Who invented blow up dolls?

Blow up dolls are a popular purchase for rowdy sports events, and festivals.

But surprisingly, to this day it remains unknown who invented them.

The earliest sex doll is credited to Dutch sailors in the 17th century who used a doll fashioned from cloth to relieve sexual tension during long stretches on the sea.

The first recorded manufactured blow-up doll appeared in psychiatrist Iwan Bloch's book, "The Sexual Life of Our Time", published in 1908.

After the sexual revolution of the late sixties, advertisements began to appear in magazines dolls with different hair colours and styles to suit customers tastes.

Did Adolf Hitler create sex dolls?

During World War 2, it was rumoured that Nazi leader Adolf Hitler ordered sex dolls to be supplied to German troops fighting on the front line.

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It was rumoured that a scheme called the Borghild Project aim to combat the spread of syphilis among Nazi troops by supplying them with sex dolls.

The project was supposedly inspired by Heinrich Himmler's 1940 memo to Adolf Hitler that there was a syphilis problem in Paris brothels.

In the report, he wrote, "The greatest danger in Paris is the widespread and uncontrolled presence of whores."

Hitler supposedly approved the project to provide dolls to the soldiers, who were to transport them in their backpacks.

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It was claimed that Hitler gave his approval to the project, and designers set to work creating a doll – or “gynoid” – under the supervision of Franz Tschackert at the German Hygiene Museum.

The lack of evidence supporting this theory led it to being deemed a hoax in the early 2000s.

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The main supporting evidence for the project were two photographs purportedly rescued from the trash, which were later disproven as a hoax.

No employee at the German Hygiene Museum recalled of such a project ever existing when asked.

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