http://captaincapitalism.blogspot.co.uk/2007/07/women-children-and-education.html
Pretty sure I already mentioned this.
Anyone reading this blog habitually knows that is due to:
- Low time preference
- High IQ
Personality trait 1 comes from genetic 2.
Breeding before you’re an adult (20s) is a bad idea.
Caution (conscientiousness), vital for good parents, and good pair-bonding ability (not promiscuous) also factor in.