It seems to be very rare, these days, for the bride and groom not to live together before the wedding. It also seems rare for couples to delay having children until after the ceremony. I work with a girl who is desperately "trying for a baby" (I love that phrase, it conjours up such wonderful images
). She's been living with her partner for 6 months. Wedding? Ooh, no, she can't afford to get married yet.
I don't understand this way of thinking. It's not a question of morals but one of commitment. "We don't need a piece of paper" seems to me to be another way of saying, "We don't want to be, legally, tied down".
It used to be something of a disgrace to live "over the brush" and those who did, generally, kept it quiet. The "shotgun" wedding was quite common too. If a girl became pregnant her boyfriend rarely had any option - he had to marry her before the child was born otherwise that child was stigmatised, not that I would like to see a return to that attitude.