The prisoners walk arm-in-arm, gaze into each others' eyes, behave like lovers. Then suddenly there is a flash of binoculars at a distant window. The strolling couples are being watched. The warden at Fort Worth Cocorrectional Prison in Texas explains to new inmates, ' You can hold hands, or walk arm-in-arm. But below bench level there'll be no physical contact at all.' The violence and tension of single sex prisons are replaced by new, but not unexpected, undercurrents. Reporter Jeanne la Chard and a Man Alive team have filmed a brave American experiment - men and women in prison together.