This is only an issue in a limited number of countries, mostly those where religious bigotry (not necessarily inter-religious though) is a strong part of the culture/history. I know of places where marriage is entered into only after one or more children if the couple want to formalise/celebrate the relationship, but where that in itself does not change the legal position because the parents are still both responsible for supporting the children and most of the time are in a legally binding position regarding ownership, inheritance, etc. This is of course precisely what those (English among them) with narrow minded views requiring conformity to strict "norms" find appalling: Never mind that all parties involved are blissfully happy and prospering and that they are splendid contributors to society in general - they are not in a marriage so they will burn in hell (but not I, no, I made certain I could be seen by all humans to have conformed, never mind what else I did and managed to keep hidden)..