Megan McArdle has a recent blog post re: her reticence to get married and have children. To which:
Bishop Sheen's book title 'Three to get Married' may provide a useful metaphor. Lovers wish, before they commit, that their ardor won't cool. This may imply that there are 'three to get married' in the sense that, in an older Catholic word, concupiscence should be part of the alignment. Nothing brings an end to history of course, with or without marriage. In marriage what arises from ardor is often a baby which brings, in a different, but also attachment provoking sphere 'three to get married.' It is like those medieval pictures of a Ptolemaic universe turning and a different sphere emerging. The sphere containing concupiscence has it's own clock and will return however and perhaps having more than one 'three to get married' may help the revolution of the spheres.