No, no, sorry. I don't have any . . ." Why does this always seem to be the first thing I'm asked? It takes my breath away, yet why do I feel the need to apologize for my reply? Looking vague and embarrassed, my questioner glances over my shoulder for someone else to talk to: someone with whom he or she has more in common, someone with children.... Just as some women talk of a visceral urge that propels them to have children, others speak of an equally visceral urge that propels them not to. Laurie, a transplanted southerner who...