A silver cup that offers a rare glimpse into the world of sexual love in ancient Rome. Neil MacGregor, Director of the British Museum, looks at the Warren cup, which features such explicit images of homosexual acts that it was once banned from America and museums refused to buy it. He explores how sexuality was viewed at this time and why the Romans were so keen to copy the Greeks. The historians Bettany Hughes and James Davidson help provide the answers. (Duration: 15 mins)