>>81594179Prostitution, especially street prostitution is a high risk job and it's common for prostitutes to end up in situations that are of a traumatic nature at some point in their career. Which is why they pick up extra PTSD.
The psychological profile of the average person to sell their body in one way or another quite commonly has a background of experiencing abuse that was unresolved. This often includes PTSD, anxiety, depression, among other mental aliments and substance abuse.
Or the tl;dr
Only broken people tend to sell their bodies, and selling their body often breaks them more over time.