Sonette Ehlers, of South Africa (the rape capital of the world), has invented an anti-rape device that goes by the name, Rapex. The device is basically a female condom with teeth lining the inside that work just like the protective spikes in a parking garage… You can go in, but whatever you do, don't back out. The teeth are angled so they allow penetration, but bite like a shark as the penis is removed; supposedly causing so much pain that it will give the woman a chance to escape. Further, according to Ms. Ehlers, the device will need to be surgically removed at a hospital, which will lead to the capture of the rapist.
But I think many woman felt uncomfortable to wear this.