Well in your post you say that selling children is never acceptable regardless of cultural norms. So if your morals are intrinsic and made up of so called "honor, honesty, logic and compassion" isn't it impossible to say that this rule should be applied to all cultural norms? How can you state...
You bring up a good point. But where did you get your internal morality that it is not ok to sell children into sexual slavery? Where did your morals come from?