Playboy founder Hugh Hefner (centre) arrives at Stansted Airport on June 2, 2011 in Stansted, England to mark the launch of the new Playboy Club in Mayfair. Famous Bunnies have included Debbie Harry and Lauren Hutton. Picture: Getty

Playboy founder Hugh Hefner is photographed at the Playboy Mansion in the Holmby Hills area of Los Angeles on Nov 17 2005. Playboy magazine founder and sexual revolution symbol Hugh Hefner has died at age 91. Picture: Getty

Hugh Hefner poses at the Playboy Mansion in Los Angeles on Thursday April 5,2007. Picture: AP

Playboy Enterprises founder and president Hugh Hefner gets a kiss from his girlfriend Barbara Benton under the tail of his 'Big Bunny' aircraft, 20/07/1970. Pic Keystone.

Hugh Hefner and Pamela Anderson during Playboy’s 50th Anniversary Celebration in New York City - Inside at New York Armory in New York City, New York, United States. Picture: Getty

American magazine publisher, founder and Chief Creative Officer of Playboy Enterprises, Hugh Hefner poses for a photograph at his home at the Playboy Mansion in Beverly Hills, Calif. Oct. 13, 2011 Picture: AP

Playboy magazine founder and president Hugh Hefner with some of his bunnies at the Playboy Club, from the TV show 'America in The Fifties'.

Hugh Hefner poses at Playboy’s 60th Anniversary special event on January 16, 2014 in Los Angeles, California. Picture: Getty Images for Playboy

Publisher Hugh Hefner and girlfriend Holly Madison flash outside The Standard Hotel on September 24, 2003. Picture: Getty

26th June 1966: Millionaire Hugh Hefner, founder of the Playboy empire, during a visit to Britain. Picture: Getty

Hugh Hefner and Crystal Hefner attend Playboy Mansion’s Annual Halloween Bash at The Playboy Mansion on October 25, 2014 in Los Angeles, California. Picture: Getty for Playboy

Playboy editor and tycoon Hugh Hefner is greeted by a group of bunny girls from his Playboy Clubs, upon his arrival at London Airport. Picture: Getty

Hugh Hefner poses with Nicky and Paris Hilton during Playboy’s annual Halloween party in Los Angeles, 27/10/2007. Picture: Playboy

Hugh Hefner during The Palms Casino Celebrates Playboy’s 50th Anniversary With Private Reception At Ghost Bar at The Palms Casino Resort in Las Vegas, Nevada. Picture: Getty

Anna Nicole Smith with Hugh Hefner

Playboy Magazine founder Hugh Hefner holding the first issue of Playboy featuring actress Marilyn Monroe on the cover. December 1953. Picture: Playboy

Miss September Olivia Paige, Miss January Anna, Sheridyn Fisher, Hugh Hefner and girlfriend Crystal Harris. 27/06/2010

Hugh Hefner poses at the Playboy Mansion in Los Angeles on Thursday April 5,2007. Picture; AP

Magazine publisher Hugh Hefner with girlfriends Holly Madison, Kendra Wilkinson and Bridget Marquardt in scene from TV program “Girls of the Playboy Mansion” Picture: Channel 9

Hugh Hefner and model Crystal Hefner attend the annual Halloween Party, hosted by Playboy and Hugh Hefner, at the Playboy Mansion on October 24, 2015 in Los Angeles, California. Getty Images for Playboy

Hugh Hefner and girls of the Playboy Mansion. Holly Madison, Bridget Marquardt and Kendra Wilkinson.

Head of Playboy Enterprises Hugh Hefner with wife Kimberley Conrad

08/04/2006. In this photo released by Playboy, Playboy founder Hugh Hefner, poses with Paris Hilton as he celebrates his 80th birthday at the Playboy Mansion in the Holmby Hills area of Los Angeles. (AP Photo/Playboy, James Trevenen)

Playboy magazine founder Hugh Hefner with Playboy models, Holly Madison in scene from TV programme “Girls of a Playboy Mansion”.

Playboy Editor-in-Chief and CEO Hugh Hefner at the Playboy Mansion in Los Angeles, California 05/04/07.

Dita Von Teese and Playboy founder Hugh Hefner attend the Playboy party at Barfly on November 15, 2002 in West Hollywood, California. Von Teese is featured as Miss December 2002 for Playboy’s holiday issue. Picture: Getty

Playmate Holly Madison, publisher Hugh Hefner, playmate Bridget Marquardt and playmate Kendra Wilkinson arrive at Columbia Pictures’ premiere of “House Bunny” held at the Mann Village Theater on August 20, 2008 in Westwood, California. Picture: Getty

Rod Stewart poses with Playboy founder Hugh Hefner at The Pharmacy on October 9, 2002 in Hollywood, California. Picture: Getty

Playboy publisher Hugh Hefner (c) celebrating Playboy’s 50th anniversary at Palms hotel in Las Vegas 20 Sep 2003.

Playboy Magazine founder Hugh Hefner attends the world premiere of Iron Man 2 at the El Capitan Theater n the Hollywood section of Los Angeles on April 26, 2010. . Picture: AFP

Publisher Hugh Hefner arrives with Girls Next Door Kendra Wilkinson, Holly Madison and Bridget Marquardt at the 36th AFI Life Achievement Award tribute to Warren Beatty held at the Kodak Theatre on June 11, 2008 in Hollywood, California. Picture: Getty

‘Playboy’ magazine founder Hugh Hefner (L) and ‘The Girls Next Door’ reality series star Holly Madison attend a signing of ‘Playboy Cover to Cover: The 50s’ at Barnes & Noble Booksellers at The Grove on November 15, 2007 in Los Angeles, California. Picture: Getty

James Caan and Hugh Hefner have a laugh during Fight Night at the Playboy Mansion on July 15, 2003 in Bel Air, California. Picture: Getty

Hugh Hefner and girls of the Playboy Mansion. Holly Madison, Bridget Marquardt and Kendra Wilkinson.

April 7, 2006, Playboy founder Hugh Hefner is photographed at the Playboy Mansion in the Holmby Hills area of Los Angeles. Picture: AP

Kiss bassist Gene Simmons poses with Playboy founder, Hugh Hefner during the Tongue Magazine Fall 2002 Issue release party at Barfly on September 27, 2002 in West Hollywood, California. Picture: Getty