'Monica has tried to move forward, but the nightmare of her affair with Bill still haunts her,' a friend told the Enquirer. 'Sheâs facing 40 without a man in her life, and seething about the way her reputation was destroyed as the whole world watched.'

The book will also include never-before-seen love letters that she wrote to the president - some of which were so intimate she never sent them, another friend added.

They reportedly detail her love for Clinton and how Lewinsky, then just 22, could make him much happier than his wife, Hillary, who the president called a 'cold fish'.

He also laughed about his nonexistent sex life with his wife - and said he thought he was not the only one looking for love outside their marriage.

'Monica can describe how Bill went on and on about his insatiable desire for three-way sex, orgies and the use of sex toys of all kinds,' the friend added.

As well as the heartbreak she suffered after her relationship with Clinton, Lewinsky also plans to detail the pain of ending a pregnancy at the height of her liaison with the president, the source said.

She was carrying a child fathered by a Pentagon employee called 'Thomas', she revealed in an earlier biography written by Andrew Morton. 'That void has never been filled,' said the friend.

Though it has been 14 years since she claimed she had nine sexual encounters with the president, her presence still looms in the life of Clinton's post-presidency and Hillary's political career.

In what was an unfortunate and awkward schedule at the Democratic National Convention in North Carolina earlier this month, Lewinsky's former rabbi - who publicly condemned Clinton during the sex scandal - gave the benediction minutes after the former President took the stage.

ABC News reported that the awkward pairing was likely overlooked by organizers because Rabbi David Wolpe is such a well-known figure in the Jewish community.

And in July, during a visit to Egypt as U.S. Secretary of State, Hillary Clinton was taunted by her husband's affair by protesters as they chanted 'Monica, Monica!'

She decided to develop the memoir after her sullied reputation meant she struggled to find work but realised she would get a generous offer for the book.

She is also writing it to get revenge on Clinton, now 66, friends said.

'For years, Monica tried to protect Bill out of a misplaced sense of loyalty,' a source told the Enquirer. 'But she no longer feels that way, and her memoir is his worst nightmare.'

During her grand jury testimony against Clinton in 1998, an immunity deal prevented her from exposing intimate details about their affair in the Morton expose that came out that year.

'But that agreement expired in 2001, and when Bill published his autobiography My Life three years later, Monica felt betrayed by him all over again,' said the source.

In the wake of the scandal, Lewinsky became the centre of a political storm and gave a series of high-profile interviews.

But unable to escape the shake the reputation, she moved to England in 2005 where she earned her master's degree and worked as a news correspondent for the UK's Channel Five News.