There’s a book coming out next month called “Fire Cannot Kill a Dragon: Game of Thrones and the Untold Story of the Epic Series”.
It covers the whole series, but one of the most interesting stories comes from the shooting of the original pilot . . . during the first sex scene between Khal Drogo and Daenerys Targaryen. Khal was played by JASON MOMOA, of course.
And at the time, Daenerys was played by an actress named Tamzin Merchant.
GEORGE R.R. MARTIN says, quote, "We’re by this little brook. They tied the horses to the trees and there’s a seduction scene by the stream. Jason Momoa and Tamzin are naked and having sex. And suddenly the video guy starts to laugh.
“[A horse] was getting visibly excited by watching these two humans. There’s this horse in the background with this enormous horse [penis]. So that didn’t go well either.”
The original pilot was so bad that it had to be reshot, and one of the changes they made was replacing Tamzin with EMILIA CLARKE.