Are you a perv? Of course you are, you pervy perv, you. At least, that’s the explicit (pun intended) promise in Perv: The Sexual Deviant in All of Us. Jesse Bering grapples with that truism that the only normal is that there is no normal. He catalogues, comments upon, and otherwise investigates the various types of sexual behaviours that are or have previously been labelled as deviant. The purpose of this exposé (pun intended),…