Kenan Malik talks to writer Marek Kohn about trust. Kohn argues that trust is a vital currency in the modern world, but what are the biological origins of trust and what is its role in society today? As new research indicates similarities between the brains of gay men and straight women, Kenan looks at the extent to which homosexuality is hardwired and what that could mean for gay people and for wider society. He debates this with Glenn Wilson, psychologist and author of Born Gay, as well as Mark Simpson, author of Anti-Queer. And artist Gavin Turk discusses the work of his 'neglected hero', British pop artist Colin Self, as the first retrospective of Self's work opens in Chichester.