Me

Good question.  I have always enjoyed sex ( more than most females)  and I had fantasized about becoming a call girl from an early age. Never thought that it would actually happen. Then I had an accident and ruined the garage door. Just so happened that a repair man was scheduled to replace the water heater the next day and while speaking with him, he suggested I scan craigslist for a used door.
  I had never heard of craigslist but soon discovered the personals and thought, hey why not place an ad and see if I can't earn enough to replace the door. Looking back, that was kind of scary and too smart on my part but I soon learned that craigslist was not the place to be.
  Being a courtesan fills my needs on so many levels. I enjoy men and meeting new people as well as old friends. I get all of the excitement that comes with setting a date and preparing for the encounter without having to worry about any commitment or relationship drama. So in effect, I get to have my cake and eat it too. Literally, LOL. I love my job

Loaded question...

It's a 'calling' vs a 'job' or 'career ' it's being of service to the greater good in all, in our own special way...
Energy that is just about us, within and flows through us.  
Everyone has different 'skills' or 'talents' or 'gifts' to offer so there is someone for everyone
Have your read  
Women of the light  
By Kenneth ray stubbs
?
Must read if this topic interest you