What do you want, when no one is watching? What do you want, when the lights are off? What do you want, when you are anonymous? When we talk about sex, we talk about womanhood and motherhood, infidelity and exploitation, consent and respect, fairness and egalitarianism, love and hate, pleasure and pain. And yet for many reasons - some complicated, some not - so many of us don't talk about it. Our deepest, most intimate fears and fantasies remain locked away inside of us, until someone comes along with the key. Here's the key. In this generation-defining book, Gillian Anderson collects and introduces the anonymous letters of hundreds of women from around the world (along with her own anonymous letter). Want reveals how women feel about sex when they have the freedom to be totally anonymous.