Quite simply, you show the girls a stream of a snake about to eat a chick. “Show us your boobies then or the chick gets it!”
And of course, it’s a video, so the chick always gets it in the end.
Of course, with chatroulette‘s strict no-nudity policy, this method has become a little bit trickier than it used to be! regardless, for this to work, you will need a fake webcam, and the original video of the snake eating the chick.
For a more reliable method of getting boobs, check out our article: How to get a girl to flash you on cam.