From CNN:
The woman inserts the latex condom like a tampon. Jagged rows of teeth-like hooks line its inside and attach on a man's penis during penetration. Once it lodges, only a doctor can remove it. The doctor inventor says: "It hurts, he cannot pee and walk when it's on. If he tries to remove it, it will clasp even tighter. Yes, my device may be a medieval, but it's for a medieval deed that has been around for decades."
Critics say the female condom is not a long-term solution and makes women vulnerable to more violence from men trapped by the device.
References:
South African doctor invents female condoms with 'teeth' to fight rape. CNN.
Comments from Twitter:
@Skepticscalpel: Great idea. The rapist would likely kill the victim.
@medical__news: I don't know, but old times chastity belts sound more promosing than this invention.
@DrJerath: Wow - interesting.