Given to her blank by her father, Otto Frank, the diary is a long-time standard on adolescent reading lists.
Researchers have revealed two pages of never-before-seen hidden text that discuss "sexual matters" from Anne's diary, the Anne Frank House announced on Tuesday.
The pages, dated to Sept 28, 1942, were contained in the red-and-white chequered diary Anne had received for her birthday in June of that year, shortly before they went into hiding.
While experts don't know why she covered up the four jokes and 33 lines about sex education, Frank mentions in her diary concern that others might read her personal thoughts.
The deciphering was done by researchers from the Anne Frank museum, the Institute for War, Holocaust and Genocide Studies and the Huygens Institute of Netherlands History. Anne and her sister died in Bergen-Belsen camp when Anne was 15.
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Another discovery behind the masking paper was writings showing Anne had a good understanding about sex and sexual development.
The Independent says she "attempts an answer, addressing an imaginary listener with a lofty tone, using phrases such as "rhythmical movements" to describe sex, and "internal medicament", to refer to contraception". "She regularly recorded "dirty" jokes or dealt with sexuality in her diary", the statement read.
Writing about prostitution, Frank noted that all "normal" men "go with women, women like that accost them on the street and then they go together", according to The Washington Post. The revelation follows a two-year image-processing investigation into pages that Anne had covered over with brown paper while in hiding from the Nazis.
Anne, who wrote about her sexual attraction to girls in the diary, seems to have blocked out the entries due to their risqué nature.
Copies of "The Diary of Anne Frank" are displayed at the exhibition "Auschwitz. The covered sections of the text are part of the object of research".
"A man had a very ugly wife and he didn't want to have relations with her", wrote Anne. The passages show how she "creates a fictional situation that makes it easier for her to address the sensitive topics that she writes about", he said.
The museum defended its right to publish the secret entry, citing major public interest in Anne's writings, which have been read by millions of people around the world.
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