This is one of the most absurd things I have ever read. A girl does not need to become pregnant to become a woman. She becomes a woman by turning 18 and being responsible. Woman are not only put on this earth to reproduce. They have their own interests and careers and they do not need to pop out a child to be a woman and be socially acceptable. Being child free is a great option.
I want to say it's one to one, but in all honesty I'm a bit fuzzy there. I can recommend JoyFreak's sister site AdminIntel - Admin & Webmaster Resource where there are lots for people of varying degrees of expertise with development, you likely can get a far more precise answer there!