Daniels said she wrote the book to tell the full story of the alleged affair and the court case as she felt she had not had the opportunity to properly address them in interviews.
She describes Trump's penis as "smaller than average" but "not freakishly small."
This isn't unexplored territory, as the adult actress has already described what the president is packing in great detail. "I am proud to call her my client and my friend", he writes.
The book, "Full Disclosure" offers a detailed description of Trump's anatomy.
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While Daniels has certainly alluded to her feelings about the alleged relationship she had with Trump, her new, explicit, and direct comments on the president's anatomy sent Twitter into an early morning tizzy.
Others have said Daniels shouldn't be revealing such "sick" details about a sitting president, but the 39-year-old will not be shamed.
On Late Night with Seth Meyers, the host introduced Daniels' description of Donald Trump's penis - comparing it to the Nintendo character Toad - and joked: "For once I'm going to say: let's not take a closer look".
Much of the text is about her decision to accept an alleged $130,000 in hush money from the Trump campaign on the eve of the 2016 U.S. election.
Daniels claims to have had a sexual liaison with Trump at a celebrity golf tournament in Lake Tahoe in 2006, around the time that the reality television star's wife, Melania, had given birth to their son Barron.