The Frank family hid from the Nazis in a secret annex in a house in Amsterdam until they were discovered in 1944.
But new imaging technology revealed the Dutch teen wrote dirty jokes on the covered pages in 1942.
After the racy remarks, Frank discussed the importance of sex education, pretending that she had to teach someone else, which allowed her to show what she knew about sex. In Paris they have big houses for that. "'How would I go about it?'"
While attempting to explain these "sexual matters", Frank used highbrow phrases such as "rhythmical movements" to describe sex, and "internal medicament", to talk about contraception, the New York Times reported.
She also touched the topics of menstruation and prostitution.
They said Anne Frank possibly wrote the text aged between 13 to 15, before she died in a Nazi concentration camp shortly before her 16th birthday. It remains unclear, however, when and why she made a decision to cover those specific pages from prying eyes.
In one passage, she wrote about her father engaging in the services of prostitutes. The first was written in a series of small notebooks, from her 13th birthday on June 12, 1942, until August 1, 1944, and was intended strictly for herself.
Ronald Leopold, the museum executive director at Anne Frank House said that Anne Frank, similar to any other teenager, was merely expressing her curiousity about sex. He calls the jokes Anne Frank wrote down classics. Her sister Margot also passed away in the camp. Anne herself presumably pasted the paper over the written pages, though it's not clear when or why.
Some months after covering over the first entry "she emphasised the importance of good and thorough sex education, and she didn't understand why adults were so secretive about it", it added.
The hidden text was originally covered up with gummed paper in the teenager's first diary.
Frank's diary has become a significant beacon in the fight against anti-Semitism.
Leopold and a senior researcher on the project, Peter de Bruijn, both expressed to the Times the value of the uncovered diary pages for offering more insight into Anne Frank's development as a writer rather than for the content she wrote about. In 1998, five additional pages were released-pages that dealt with what Anne saw as the strained and false relationship between her parents. "From an academic point of view, making them accessible is just as much a matter of course as revealing a hidden image beneath a painting by Rembrandt", they write.
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