Scotty Bowers, a former Marine turned rent boy for some of Hollywood’s biggest names in the 1940s, claims to have had threesomes with the royal couple Duke of Windsor and his American wife Wallis Simpson.

Scotty Bowers, now 88, has opened up his little black book and told all, shedding light on his prostitution ring which he claims catered for the royal couple as well as gay and bisexual A-listers such as Cary Grant, George Cukor and Rock Hudson.

His book, “Full Service: My Adventures In Hollywood And The Secret Sex Lives Of The Stars”, opens the doors of the closeted, X-rated underworld of old Hollywood through three decades.

Stories in the 286-page book tell of arranging bedroom partners for actresses like Rita Hayworth and Katharine Hepburn, who he claims he set up with “over 150 different women”, reports the New York Times.

Scotty Bowers’ own lovers included Edith Piaf, Spencer Tracy, Vivien Leigh and Cary Grant, as he claims.

The former Marine also says he provided services for the Duke of Windsor – who had abdicated as King Edward VIII – and his wife Wallis Simpson, allegedly sharing a series of three in the bed romps with the couple.

Scotty Bowers’ book, “Full Service: My Adventures In Hollywood And The Secret Sex Lives Of The Stars”, opens the doors of the closeted, X-rated underworld of old Hollywood through three decades

Scotty Bowers has been inundated with book and film offers but has until now remains tight-lipped over the secret lives of his famous clients.

“I’ve kept silent all these years because I didn’t want to hurt any of these people,” Scotty Bowers told the Times in an interview, adding that he doesn’t need the money.

“And I never saw the fascination. So they liked sex how they liked it. Who cares?

“I finally said yes because I’m not getting any younger and all of my famous tricks are dead by now. The truth can’t hurt them anymore,” he told the Times.

However, Scotty Bower’s chronicle of old Hollywood’s sexual underground is likely to upset the relatives and fans of some of those exposed.

Scotty Bowers, who now lives in Hollywood Hills with his wife of 27 years Lois, said it all started in 1946, when he was just 23.

Newly discharged from the Marines after World War II, Scotty Bowers got a job at a gas station near Paramount Pictures, reports the Times.

The former Marine was pumping gas one day when actor Walter Pidgeon drove up and propositioned him with a $20 bill.

He accepted, and soon the word spread. According to Scotty Bowers, he stumbled into a business that he ran from his base at the gas station, servicing clients himself as well as setting them up with his handsome Marine friends.

Scotty Bowers, whose striking good looks attracted Hollywood’s biggest icons, said the station was a “safer hangout” then gay bars, which were often raided, reports the Times.

“Sometimes police would come around, sure. But I think I never got caught partly because I kept everything in my head. There was no little black book,” Scotty Bowers told the Times.

However, Scotty Bowers quit his job in 1950 and told the Times he supported himself for the next 20 years through prostitution, bar work and working as a handyman.

In his book, Scotty Bowers writes that, in addition to his gay clients, he also gained a following among heterosexual actors like Desi Arnaz, who used him as a matchmaking service.

Scotty Bowers claims he never accepted payment for organizing sexual encounters, reports the Times.

“I wasn’t a pimp,” he said.

Scotty Bowers, who told the Times that he prefers the sexual company of women, said he continued his unorthodox life until the onset of AIDS in the 1980’s and he got married in 1984.

The disease “brought an end to the sexual freedoms that had defined much of life in Tinseltown ever since the birth of movies,” Scotty Bowers writes.

“It was obvious that my days of arranging tricks for others were over. It was too unsafe a game to play anymore.”

Scotty Bowers’ story is set to be published by Grove Press on February 14 and is written with Lionel Friedberg, an award-winning producer of documentaries.