I have never gotten the whole selfish-not-to-have-kids thing. To me it is a perfectly sensible choice to make when one sees that one might not be able to be a parent. Actually I think some people are selfish to have children, when obviousely not able to take proper care of them. Or just plain has no interest in becoming a parent, for whatever reason. I have a child, but it was quite a surprise pregnancy, but I went from surprise to elation pretty fast... And now my son is the most wonderful thing in my life. But of course, sometimes I wonder if I have passed on the genetic part of bipolar to him. (I come from a "bi-polar" family). Tough call to make though...
And I totally agree with Hooligan as well.