Being that nudity and sex are a pretty big part of the series, it makes sense to find people who are already comfortable with those dynamics.
There's likely a lot less shyness present on set when it comes time to get down to the nitty gritty if the actor is already well-acquainted with the content being filmed.
When casting a few key roles on Game of Thrones, the producers enlisted the services of adult film stars to help give the roles and scenes a more authentic feel.
Some of the Game of Thrones characters who turn out to be adult film stars in real life might even surprise you.
Below is a list the characters, and actresses that played them, who turned up in the series, as first shared by Scoop Whoop.
Scroll down to see 6 real adult film stars who appeared in Game of Thrones:
Who she played: Shae
On Game of Thrones, Sibel Kekilli starred as Shae, Tyrion Lannister's now-deceased mistress.
Shae was actually a very important character on the show until season four when she was revealed to have betrayed Tyrion for his father Tywin and murdered her by choking her to death.
Before securing the 20-episode run she enjoyed on Game of Thrones, Kekilli made a big splash in the adult entertainment industry as a performer named Dilara.
It's said that she even did 12 films in one year.
Who she played: Armeca
Starring as one of Littlefinger's brothel girls, Knight appeared in four episodes of Game of Thrones.
Born Saeeda Vorajee, Sahara Knight is her film-name.
She starred in her first adult film way back in 2004 and has continued to work in the industry.
After her stint on Game of Thrones, Knight went back to making a small handful of porn films, with her most recent one having been released this year.
Who she played: Craster's Wife #2
Believe it or not, Walker once turned down a role in Game of Thrones.
No known explanation was ever given, but it certainly is surprising as cosplaying was her main area of expertise in the adult film industry.
Eventually, she agreed to a role on the show, appearing as one of the wives of Craster, a wildling who lived North of the Wall.
She continues to run her own adult website and is self-described as "perverse and proud."
Who she played: Daisy
30-year-old Maisie Dee is said to be a well-known adult film star in England.
She appeared in three episodes of Game of Thrones as Daisy, one of the girls in Littlefinger's brothel.
In her final appearance on the show, Joffrey forced another prostitute to beat her to death.
According to IMDB, Dee has appeared in just over two dozen adult film scenes.
Who she played: Whore #1, The Stranger / The Mother of Dragons, and Bathhouse Prostitute
Bentley starred in three different episodes of Game of Thrones, and each time she was credited as someone different.
In addition to starring on Game of Thrones, the adult film star also starred in a Wiz Khalifa music video.
Back in 2013, she won the AVN award for " Best All-Girl Group Sex Scene," and, according to IMDB, has around 80 adult films in her repertoire.
Speaking about what it was like to star in Game of Thrones, Bentley was once quoted as saying, "It’s such a different experience. For example, a closed set is 100 people. If a porn set is closed, it’s the camera dude and whoever is f******. They say closed set and still have 100 people – an entire crew!"
Who she played: uncredited nude extra
During her first year in the adult film industry, 24-year-old Jessica Jensen won the UKAP Best Female Award.
She started out as an insurance saleswoman, then tried some hand modeling, eventually ended up making porn films.
In season three of Game of Thrones, she appeared as an extra but then turned up on the show again in season six.