Rapex - a condom-like device that a woman inserts before going out. The inside is lined with tiny hooks which imbed themselves in a rapist's penis and can only be removed from his organ by a doctor.
For women who live in high-crime areas, or parts of the world where rape is a common form of female subjugation, this is a boon.
http://www.rapestop.net/gallery/fold...+open+position