Genes 'to blame for infidelity' Some people may be genetically programmed to be unfaithful, a scientist claims. Professor Tim Spector, of the Twin Research Unit at St Thomas's Hospital, London, says sutdies of twins suggest a genetic component to infidelity. If one of a pair of women twins has a history of infidelity, the chances her sister will also stray are about 55 per cent, he claims. And the tendendy for the pair to be either faithful of unfaithful is strongest in identical twins, who have the same genes, he says. In general he claims the proportion of women as...