Actually, I was reading some time back that an increasing number of people postpone marriage but not children. They feel "ready" for one but not the other. Yeah, ridiculous. If you can't handle an adult, how will you handle a child?
Evidently, many young men want sex but are not interestd in marriage. You see that attitude in all the movies where the guy is 30yo but is trying to act 17.
At the same time, many young women want the big wedding they see in tv and movies, but think having a kid without some stable home life is just fine and don't want to wait to have someone in their life who loves them.
I understand this is a generalization covering only a (hopefully) small portion of the population. But it's...unsettling.