A study of mobile phone calls suggests that women call their spouse more than any other person. That changes as their daughters become old enough to have children, after which they become the most important person in their lives. The study has been published in the journal Scientific Reports. It also shows that men call their spouse most often for the first seven years of their relationship. They then shift their focus to other friends. The results come from an analysis of the texts of mobile phone calls of three million people. According to the study's co-author, Professor Robin Dunbar of Oxford University, UK, the investigation shows that pair-bonding is much more important to women than men. "It's the first really strong evidence that romantic relationships are driven by women,"...