HBO's biggest hit series "Game of Thrones" is back with its season 4. The show that haswidespread fan following is not only popular for its interesting yet complicated plot but also for its intense sex scenes. According to the latest cast news, "Game of Thrones" creators have enlisted at least six former or current porn stars as series cast members, according to the New York Post. While fans met Sibel Kekilli, Maisie Dee and Sahara Knite in previous seasons, they will be introduced to three more actresses this season. Here is a brief introduction to the six porn actors enlisted by "Game of Thrones" creators in its four seasons.

[Warning: The article contains potential spoilers from "Game of Thrones" series. Read only if you want to know more about it.]

Sibel Kekilli who plays Shae is a former porn star and was the first adult film actor to be hired on "Game of Thrones." The German actress made her first appearance on the fantasy television show as a guest star in season 1. Sibel's character Shae, who is Tyrion Lannister's (Peter Dinklage) lover, gradually became a series regular. Prior to this, more than a decade ago, the actress appeared in several adult films using Dilara as her anonym.

Kekilli is not the only "GOT" cast member who has worked as a porn star. Samantha Bentley is an award winning porn star of British decent. She has earned herself several awards for her work in the adult film industry and was honoured with the title of "Best Female Performer" at the UK Adult Producers Awards in the year 2013. Bentley is yet to appear on "GOT."

Another award winning adult film actress who has been named as official cast member of "Game of Thrones" is Jessica Jensen. The British actress made her first appearance in the adult films industry in the year 2011 and was named "Best Newcomer" at the UK Adult Producers Awards.

Both Jessica and Samantha are expected to appear in "Game of Thrones" season 4 but their roles are not yet defined.

British actress Maisie Dee is another porn star to be recruited as a cast member of the TV adaptation of George R.R. Martin's first volume of the fantasy novels series "A Song of Ice and Fire." Dee appeared in "Games of Thrones" season 2 and portrayed the role of Daisy, Petyr Baelish's (Aidan Gillen) prostitute. Her character was subjected to King Joffrey's sadism in season 2. Maisie Dee will not be seen in "GOT's" ongoing season.

Australian actress Aeryn Walker is said to be an "amateur" adult films actor who reportedly has "penchant for 'costume play'." Actress is expected to appear in "Game of Thrones" season 4 and she will play the role of Craster's wife.

Sahara Knite is one of the six porn stars to be recruited as "Game of Thrones" cast member. Before joining the adult film industry, Knite worked as a clothing technologist for 6 years. Later, she joined "GOT" cast as Petyr's prostitute alongside Maisie Dee in season 2.

"Game of Thrones" season 4 premiered on Sunday, April 6, 2014. The show recorded the series' highest ratings with 6.6 million viewers tuning in for "GOT" Season 4 premiere, according to Entertainment Weekly. It was the largest audience number since "The Sopranos'" finale episode aired in the year 2007. Meanwhile, the network has officially renewed the "GOT" for two more seasons as announced by HBO Programming president Michael Lombardo on April 8, 2014.