Girls raised in homes with non-genetically related men tended to reach puberty faster. I don't know if this is because of pheromones or sexual abuse or simply that the things which cause divorce are genetic and related to early puberty. Also, I hate to say it, but in America African Americans statistically have an earlier onset of puberty and a higher rate of extra-marital childbirth. I have no clue if this is nature or nuture, but the trend is there.

As for attraction, marriage correlates with an ability of parents to invest in their children. Are you spending your cash on your family or on 'dating?' Stay-at-home moms make healthier meals, etc.