Documentary exploring the phenomenon of EL James's erotic novel, which is the UK's fastest-selling paperback of all time (you people are dirtbirds). The programme examines the sociological and cultural effects that Fifty Shades of Grey is having on the nation, with visits to a spanking class for novices and an S&M couple who have had contracts for sex drawn up for each other. Psychologist Pamela Stephenson, Belle de Jour author Brooke Magnanti and members of a North Yorkshire book club offer their views on the novel. What, no appearance from Oprah?