One in five women is a PANK. "No matter how much a child's mother and father loves them, they're only two people," Notkin says. "Childless aunts can provide children with experiences they may never have had. I'm an author; my brother and sister-in-law aren't. I do things that their parents don't do ... the parents know I add value."
Sixty-eight percent of PANKs, according to a study Notkin commissioned, say the children in their lives view them as a role model. And about 64 percent of them enjoy spending times with kids but are glad they are not parents themselves. Cattrall seems to fit in that category.
"Timing-wise, it was never right," Cattrall, 59, says of her no-kids lifestyle. "I have been married, and I enjoyed very much being married, my two marriages. But we never really got to the point where it seemed a natural progression in our relationship that we would become parents."
Would Samantha, Cattrall's Sex and the City character, consider herself a PANK? Notkin says no. Carrie was a savvy auntie to Charlotte's daughter, but not so much Samantha.
True to that character, the most durable of Cattrall's relationships appear to be her female friendships.
"You're born into a family unit, which you don't choose," she says. "And then you make your family. And men, for a lot of women of my generation, they come and they go. But that family that you've created, they stay. Those are the people that I want around my bedside, you know, when I croak. Those are the people who I know that I can really rely on - because they've actually been there all along."
Now that sounds a lot like Samantha.