Purity is Possible: How to live free of the fantasy trap

One in five Christian women use pornography. One in three visitors to a porn site is a woman. Many, many more women read explicit books like Fifty Shades of Gray. Even more than that write their own pornography—not on paper for publication, but in their heads for their own use.

Helen Thorne knows all this because she's done it.

But no one talks about it. Our churches are silent on it. There are very few books about it. It is the unspoken struggle of thousands of Christian women—perhaps you, a...