Sonette Ehlers, a retired blood technician was extremely alarmed by the high rape statistics in South Africa, which has one of the highest rates in the world. She decided to do something about it and came up with the Rapex.
It is based off of the legend of the vagina dentata, or a vagina with a set of teeth. It comes from South Asian mythology and speculative fiction. The Rapex was unveiled in August of 2005. The device is able to be inserted in a woman any time she feels threatened of sexual assault.
The spikes on the inside of the condom are meant to end intercourse immediately. The spikes stick into the penis. It is meant to only cause superficial damage, though. The rapist must go to a hospital to have it removed where they would promptly be arrested.