Seriously, calling it a human rights issue is an insult to the concept of human rights. No woman should ever be required to have sex with anyone she does not want to, nor will it ever be possible to legally defend such a position based on you paying for service (as the above poster so eloquently stated)
You will never be entitled to have sex with a person just because you have cash on hand. Heck you even see on most SP ads that you are paying for the time and anything extra is between two consenting adults.
I don't mean to sound aggressive, but there really are people with a lot bigger problems in this world than some hot escort that won't see them because of her personal preference. People are quick to scream human rights violation on the smallest of issues these days without really giving it much thought.
Besides, what kind of experience do you think you would have with a woman that doesn't even like you and why would you want it?
She probably listed it as a time saver for herself and anyone looking to be involved with her. Whether she still gets other people's business is their choice.