BuzzFeed News spoke to Dr Ian Roberts, curator of the National Collection of Yeast Cultures at the Institute of Food Research, about the project.

He said that in over 30 years of working with yeasts this is the first time he's heard of anyone baking sourdough using yeast from their vagina. However, in theory "it is not impossible" to do.

"Sourdough cultures are generally made using microbes that fall in from the surrounding environment," he said, "but there are many different species and strains of yeasts, not all of which can be used to make bread, and some of which cause diseases."

He said the yeasts we would normally use for baking, Saccharomyces cerevisiae, are not likely to be found in our body's cavities.

"It is very unlikely that baking yeast will be included in samples from an individual, while there is a much greater probability that disease-causing yeasts will be," he said.

"However, the baking yeast species, Saccharomyces cerevisiae, has been isolated both from sourdough and from human sources so to this extent [baking sourdough with vaginal yeast] is not impossible."