Diarmaid MacCulloch concludes his exploration of how Christianity has shaped Western attitudes to sex, gender and sexuality throughout history. This last episode sees him heading to the streets of London's Soho and then to Paris and Rome, where he investigates how society has evolved on these issues - from the role of women to the acceptance of homosexuality. The Church now (thankfully) takes a back foot, but Diarmuid wonders just what the future holds for Christianity.