This thought experiment was brought up in an episode of Penn & Teller's Bullshit! and it was actually quite interesting. Penn suggested that it become law that every woman in the US be given a gun, free of charge. She could use it for target shooting, for self defense, or sell it. In the thought experiment, Penn said that we should assume half of the women in the US just flat out sell their guns.
Now imagine the possibility here. What if half of all women in the US had a handgun for self-defense? Not a knife or a blunt object, but a loaded handgun? What would that do to rape statistics?