It's easy to get someone to pick up your dry cleaning or take your kids for the weekend, because even when they say no, there's usually a workaround. In non-sexual situations, no usually means maybe because most people are either lying to you or to themselves. Even when people want no to mean no, it is usually a breeze to prey on their desire to please or their need to be liked, especially if they were fat in high school.
Persistence and some basic understanding of human insecurities are all you need to get you out of life's dirty jobs for the rest of your life.