The pages contain four "dirty jokes" and an explanation of sex, contraception and prostitution, the ABC reports, which were covered with gummed pieces of brown paper when the diary was first found - presumably Anne's attempt to hide her risqué writing from her family.
Anne wrote in her diary until she and her family were discovered by the Nazis in 1944 and deported to Auschwitz.
At the time, Frank was 12 years old and curious about sex and relationships like other children her age.
Brown paper had been used to cover the two pages in Anne's first diary, but digital and image processing technology was used to decipher their contents.
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During her time in hiding, she wrote two versions of the diary.
"[The pages] bring us even closer to the girl and the writer Anne Frank", Ronald Leopold, executive director of the Anne Frank House Museum, said at the press conference.
By shining a light through the paper and photographing the pages in high resolution, researchers have managed to read the text on two covered up-pages of the diary.
The Frank family, originally from Frankfurt in Germany, had left for the Netherlands when the Nazis gained control in the 1930s.
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Frank's candid words on sex didn't make it into the first published diary, which appeared in English in 1952.
Bruijn explained, "She starts with an imaginary person whom she is telling about sex, so she creates a kind of literary environment to write about a subject she's maybe not comfortable with".
Some months after covering over the first entry "she emphasized the importance of good and thorough sex education, and she didn't understand why adults were so secretive about it", it added.
"Over the decades Anne has grown to become the worldwide symbol of the Holocaust, and Anne the girl has increasingly faded into the background", it said in a statement. Later, researchers realized the underlying text was partly visible and modern software could probably decipher it. Though Anne herself edited her diary with an eye to publication, the book-released eight years after her death from typhus in theBergen-Belsen concentration camp at age 15-contained additional cuts.
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Writing about the decision to publish pages that Anne clearly wanted to keep hidden, the museum said that her diary - a Unesco-registered world heritage document - held significant academic interest.
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