My wife and I have no kids but I tell people we're a one child family - I'm the child. ;-) Children make me smile when I see them but I have no desire to repro

My wife and I have no kids but I tell people we're a one child family - I'm the child. ;-) Children make me smile when I see them but I have no desire to reproduce. Natural selection has selected for parents that experience great joy in having children. Those that didn't have this response probably ate their young. <g>