There's another aspect that isn't mentioned as often that doesn't have to do with children. Even if a man is responsible and doesn't get a woman pregnant before marriage, there is an incentive for divorce under the current alimony laws. Even if the man isn't rich, unless there's a pre-nup (which is extremely cumbersome) the woman can force the man to pay alimony if she just tires of him. So there's an incentive to divorce rather than actually be responsible adults and work through their issues. Some men know this and it keeps them from getting married.