Something I find missing from these discussions (though I admit I haven't read all the comments yet) is the fact that having children or not is a highly personal and private matter, and anyone who asks such personal questions is being rude and intrusive. I know many people who are childless because of miscarriages, health issues, or death of a child. It must be horrible for them to be asked,"Why don't you have children?" or to be called selfish. Think of the family who recently lost three children in a fire in BC. Are those two sets of parents going to be asked by people who don't know their story, "Isn't it about time you had children? Are you selfish?" For those who choose not to have children, why would you answer anyone's questions about it? You probably wouldn't tell friends, relatives or strangers your salary or bank balance or other private information, so why should this most personal of matters be any different? I have the greatest respect for people who never mention their sex lives or decisions on having children. Let's bring back some old-fashioned good manners!