Craigs List

So i have the idea do do this film about women who get payed for sex and the reasons behind this. I go to craigslist and begin to click around until i found "adult gigs". Under this topic i read some of the most raunchy and distrubing things i have ever seen. As i read through this i tried to understand why someone would stoop to the level of participating in such risky and discusting situations. These people who try and sell there sexual services via craigslist must have some sort of issues. I am inrterested to get the stories behind some of these so called "friends with benefits?