You have a point, Olivia. I've actually interviewed more than two sex workers. The number is closer to a dozen. The stories they shared with me form a common pattern, though, which is why I did not bother repeating their individual stories here.
As for the escorts on planet Earth, I cannot interview all of them. No single person can. All I can do is write out of my own subjective experience and leave the objective analysis to the researchers and the scientists. I hope that helps :)