W/we've been enjoying a show called "The Big Bang Theory" for the past few months. Enough so that the earlier seasons were purchased on dvd and have been watched thoroughly over recent weeks. :)
One episode in Season 3 features Sheldon using behavior modification practices to change some of Penny's behaviors that bug him. He uses chocolates, offering her one every time she behaves the way he likes. At the end of the episode, Penny convinces Leonard to do something she wants, with the promise of sex, at which point Sheldon discovers that sex is an even better behavior modifier than chocolate. He's quite surprised and wonders aloud if anyone else has discovered this.
Well, yes, Sheldon, I think others may have discovered this nugget of wisdom, but perhaps the domly types around here are better able to speak to that than me. ;)
Imagine that! Using sex as a means of controlling another person. Who knew? :P