Nevermind, first thing that came to mind when I saw that was STD's. I personally wouldn't ever do it, because knowing that the girl is just doing it for money and probably doesn't like me is a huge turn off. As a last resort I would just use a dating site if I was that desperate.
You are just as likely, infact probably even more, to catch an std/i from a regular person you sleep with. Even using condoms isn't total protection
You could get married as a virgin, and find yourself infected then, through no fault of your own. You could just have regular protected sex and still catch something. You can even be born with some stds.
Don't see the word escort and assume they are likely to be more disease ridden than a regular person on the road, the risk is the same no matter which path you start to fuck on.