Story here. Excerpt:

'Across the United States, the number of households headed by single fathers almost doubled between 1990 and 2006, from 1.15 million to 2.1 million – or 20 percent of all single-parent families, US Census Bureau figures show. No longer willing to accept that the mother should automatically look after the children – the "pay up and shut up" narrative in divorce – fathers now are competing more aggressively for custody and are winning cases.'