> I believe I have enough experience to tell if a girl is enjoying her time with me
Do consider that it is in the service provider’s interest to make you think this. When you are paying money for experience, you can’t use how the experience makes you feel to evaluate how the employees feel about it.
> If a girl gives signs that she doesn't enjoy [it, I] never visit her again.
Can’t you see how in this situation it would be in the sex worker’s interest to give signs she enjoys your thing? If she does not, she looses a customer.
I’m not saying that prostitution is wrong or that some sex workers don’t enjoy they job. It just might be the only realistic option for someone.
Some things that a country could do so that people have the option to not be a prostitute:
* food and housing for people who need it
* equal pay and career opportunity for men and women
* drug treatment programs that don’t put people in jail for addiction
See “Revolting Prostitutes” for more details