Book excerpt: The authors have probed the deepest passages of history, lapped at the lake of human knowledge and plumbed the depths of our shared experience to bring you the truth about oral sex. Why not suck it and see...? Here are two little nuggets of oral wisdom: 'I tripped', said Walter Taylor of Elsmere, Cincinnatti, defending himself against a charge of performing unlawful oral sex on a naked, sleeping woman. (Thanks to The National Enquirer for that one.) OR 'If that's not sex, then the number of times I've had sex has dramatically decreased. From a mountain to a valley, baby!' said an anonymous teenage girl answering a US schools survey following Bill Clinton's definition of sexual relations. And after all that, if you're lucky, we'll give you advice on how to give and receive give oral sex too...