Personally I cannot understand it. We aren't infertile but have trouble conceiving. I really didn't care with our last 2 about the gender and I don't care about subsequent children either if we are lucky enough to have any. It would be nice to have a girl, just to experience parenting both sexes, but I would love another little boy, and as long as he/she is healthy then I don't care. I think its incredibly selfish, even if these women don't realise it. Being able to have children is incredible in itself, it shouldn't matter what gender the child is