I think things are definitely different now. I remember watching a game show and when the chap won some money the host said, jokingly, "you'll be able to get married now". The chap, looking a bit sheepish, said that no, he did want to get married but not just yet as it was a big commitment. He and his partner had two children. I was amazed that he felt going through a marriage ceremony was a bigger commitment than having children.
I'm not having a go at couples with children who are unmarried - my own son and his partner have two children and they're not married. I just think some people's priorities are very strange.