Since they banned erotic ads on craigslist, it only makes sense to assume that prostitutes have still been selling their desperate whore bodies through other ads. I'm pretty sure they're using sales ads as euphemisms for offers of sexual intercourse, and since the list of possible euphemisms is endless I believe that nearly all ads with phone numbers are open calls when looked in to far enough.
Therefore, I propose we call these ads up and call them on their shit, and rid the internet of prostitution forever!