Don't call Kim Cattrall "childless," you jerk! (See how it feels to be called something you don't like?)
Actress Kim Cattrall was on BBC 4's Woman's Hour and explained why even though she never had kids, she still considers herself a parent:
I am not a biological parent, but I am a parent. I have young actors and actresses that I mentor; I have nieces and nephews that I am very close to. There is a way to become a mother in this day and age which doesn't include your name on the child's birth certificate. You can express that maternal side, very clearly, very strongly. It feels very satisfying.
She also took issue with the term "childless":
Well it's the "less" that is offensive, isn't it? Child-less. It sounds like you're less because you haven't had a child.
It does sound kind of judgmental and Jane Austen-y, now that you mention it. And there are so many better descriptors for the woman who played Samantha Jones. This would all be a lot easier if we just adopted the same respectful term to use for all humans: Beyoncés.
You can listen to Cattrall's entire interview here.