Hmm I'm not sure. My girlfriend and I are presently both always saying we don't want kids and at least not ANY time soon (i'm 19, shes 20) but I have a feeling we will both mature and our priorities will change and one day kids might become an option...(whether we are together or not, just as individuals). And it wouldnt really put me off a girl at this stage who says she doesnt want kids, in fact its quite refreshing really cos I feel the same way. And everything can change. So I guess you'd just have to go with your feelings on the girl overall and not based on this one thing.