Think about what you already assume about sexual consent.

Fifty Shades of Grey won the 2012 Specsavers National Book Awards for the most popular book of the year, and it is estimated that as many as a third of British women have read at least one of E L James’s erotic ‘Fifty Shades’ trilogy.

With less than a month to go until the film adaptation hits British screens, women’s groups across the UK are now mobilising.