I am child-free as well, so far by choice. I also agree with Stargazer; the longer that seems to be, the less likely I think that I will have kids.
Personally, I LOVE children entirely too much to have them myself. Sounds odd, I know, but I have very high expectations of parenthood and being a parent; one that I think our society doesn't hold. And being an L&D nurse, I've seen the worst parents our society has to offer. So, I feel I am entirely too selfish to be a good parent.
My kids should be primary, and I don't feel I can really do that if I am concentrating on my job AND school AND my social life as well. I guess I feel I can only do so many "jobs" effectively before one of them starts to suffer.
At this point, though, I AM a momma to one black kitty named Samantha, and WILL be a momma to a 6 week old Pug named Fudge.
We pick him up Saturday.