as much as it seems like we are headed in the direction that women will no longer be able to naturally bear children (oh its coming, you mark my words) they still can...
the genes for her to not be able to have children naturally fell out meeeeeeellllliiiioooonns of years ago...
look at it from a darwin standpoint and you'll see your mom really is just shoveling a load right in your path....
just step around
