Young women pack out Vauxhall’s pubs on a sunny summer evening. They chat over Diet Cokes, pilsners and passion-fruit-flavoured vapes. Many smoke rollies, some do ket and cocaine. Eyes rarely widen at the mention of such things; bring up the Pill, however, and you elicit a flurry of disdain and lively debate. Once seen as a tool of sexual liberation, the Pill is now often spoken of as a pharmaceutical menace, wreaking havoc with female moods and increasing the risk of cancer. It was first...