Just about everyone has sex fantasies - and there are lots of reasons why. In fantasy land, there are no rules and you are in charge of the action. But there's a second type of fantasy - one that won't leave your head and which the truly adventurous want to see through to reality with consequences they can't always foresee.

This book, by sex expert Tracey Cox, is about both types of fantasies: what women dream about - and what happens when they dare to take what existed perfectly in their heads into the stark (sometimes funny, or awful, or thrilling) reality of their beds.

Here are women's most incredible and intimate secrets laid bare.