Dr Rodolfo Llinas, a neuroscientist, was once asked for his opinion on eternal love and replied: "That is the preserve of geniuses alone". Outrageous as it may be, this statement nevertheless contains a grain of truth and offers a useful insight into how we assess romantic relationships. Llinas suggests that we should never take the success of our romantic relationships for granted. To envisage the highest form of intelligence at work in a couple’s future is to recognise ju