No knight in shining armour? What's a single woman with a ticking biological clock to do? Amanda Hooton meets three mums who found their own solution.Kirsty Stead, 38, has dark curly hair, pale freckled skin, and a big laugh. One day in July 2009 she sat down at her computer and began looking for The One. But she wasn't looking for moonlit walks or romantic dinners: what she wanted was what novelist Jeffrey Eugenides calls "the tiny sputter ... the meagre leaven ... indispensable to the grand achievement of having a baby". What she wanted was sperm.