when your doing it to a girl whos legs are pointing at about a 120 degrees angle, they you grab her legs and pull them apart as hard as possible. this will not only feel great, but it will also pull her hamstring. (depending on how hard you pulled)

When you eat dirt for the first time and leave your family to build a shack in the woods

one who is extremely vulnerable to orgasms and upon obtaining said orgasm feels a surge of energy through their legs causing them to split apart violently.