Think about the situation they are in. Nobody wants to suck you off for $10. You do it when you have nowhere else to go...think of that when you think your life really sucks. You don't have to sell your dignity for a few bucks.
I don't know about where you live, but around here, even McDonald's turns people away. The job outlook for college graduates isn't good. That's my line of work. Either way, McDonald's is minimum wage and won't pay the bills. Think how much you get-do you have a lot left over? You don't get 5.15 an hour.