It was billed as the 'sexiest novel of the decade' and features erotic scenes that would make Fifty Shades of Grey author E. L. James blush.

And now speculation is rife that Trump Tower was penned by The Donald himself, despite being credited to author Jeffrey Robinson.

The 2012 book, which follows the 'sordid lives' of those living and working in the Manhattan skyscraper and features a 'cameo' by Bill Clinton, was initially heralded as Trump's debut novel.

It describes several of the female characters' 'gorgeous breasts' and even sees one male character say how every man needs a 'little p***y'.

The agent for Jeffrey Robinson, when contacted by DailyMail.com refused to say who wrote the book.

Speculation is rife that Trump Tower was penned by The Donald himself, despite being credited to author Jeffrey Robinson, pictured (left) is original cover and (right) the final version

Speaking on behalf of Mr Robinson, his agent LN Fowler said: 'Jeffrey would be happy discuss the novel with you after the election'.

The original cover artwork featured the Republication presidential candidate's name splashed in large gold letters - impossible to miss - above Robinson's name.

But Trump's name mysteriously disappeared from the cover, along with his author credit in advertising material for the book seen by the Huffington Post.

The novel features one scene where the general manager of Trump Tower checks on a tenant, Cyndi Benson, to find her tied up with her legs 'stretched wide apart'.

It is not clear whether Trump wrote the book himself, or relied on Robinson as a ghostwriter

Trump's name mysteriously disappeared from the cover, along with his author credit (pictured) in advertising material for the book

'Slowly opening the door — 'Miss Benson?' — there she was, completely naked and gagged, her arms above her head, handcuffed to the top of the brass bedstead, with her legs tied to the bottom of the bedstead, stretched wide apart,' it reads.

'Being two or three pounds heavier than she'd been as a teenager — she now had absolutely gorgeous breasts.'

In another part of the book, one character describes how every guy needs a 'little p***y'.

The book regularly describes women's breasts and one of the characters, Mikey, tries to get as many guests as possible to take off their tops.

One part reads: 'After the woman fell asleep, Mikey came out, looked around and saw there were at least six women not wearing tops. He proclaimed: 'I'm dead. I've gone to boob heaven'.'

When it was released, Trump said he could 'not wait' to see the novel be made into a TV series

Bust-size is repeatedly mentioned with lines like: 'She was dressed in white, with her blouse open to her navel, which did nothing to hide her small breasts.'

The novel also depicts how one of the employees had sex on the set of Celebrity Apprentice.

When it was released, Trump said he could 'not wait' to see the novel be made into a TV series.

'Jeffrey Robinson's novel Trump Tower bares it all,' Trump wrote in the only review blurb on the back cover.

'Here is the drama of the Ultra Rich, the Ultra Powerful, and the Ultra Beautiful who call the most glamorous address in the country their home. I can't wait to see it on television!'

It is not difficult to see why some believe the novel was penned by Trump

The publisher, Perseus Books Group, also originally marketed the book as 'the debut novel from New York Times-bestselling author, international business mogul, television superstar, and New York City icon, Donald J. Trump.'

It is not clear whether Trump was supposed to have written the book himself, or relied on Robinson as a ghostwriter.

Part of the book is reminiscent of a recording taped by NBC's Access Hollywood in 2005 which sees Trump talking about his sexual exploits.

'When you're a star they let you do it. You can do anything,' he said in the recording.

When speaking about meeting beautiful women, he said he feels able to 'grab them by the p***y'.

MailOnline has reached out to Donald Trump for a comment.