This chapter concerns with the various professional practices through which that world was rendered increasingly legible between 1945 and 1968. It argues that the process of uncovering, dissecting and mapping the social world of the male homosexual and his relations with the broader society took place relatively late in Britain. The male homosexual in Britain had a relatively invisible social presence prior to 1945 is also to say much about the relative invisibility of the social sciences in Britain before the Second World War. The aftermath of the war, the human sciences were called upon to deal with a number of so-called 'social problems', the declining birth-rate, divorce, anti-Semitism, race relations, juvenile delinquency and homosexuality. Gerrit Theodore Kempe's article marked something of a watershed in writing published in Britain about homosexuality.