In the village of Lhazarene, Dany is appalled by the rape and slaughter that she's seeing. Khal Drogo is moving, he’s taking his khalasar towards the sea to begin the conquest of Westeros, but it's quite a way to the sea and, of course, they have to be fed and find a way to get ships to take them across. Slaving is one of the ways the Dothraki earn money, although they don't look at it as earning, they look at it as an exchange of gifts. The Dothraki do not actually believe in buying and selling in the same way as the more mercantile civilizations of the West… Dany can't enact the idea of “don't take slaves”, but what she does there is saying “I'll take the slaves. I'm the queen, all the slaves belong to me.” and in that way she can extend some protection over the women who were being raped.
- George R.R. Martin, Game Of Thrones DVD











