1. Smart people are more likely to go to college. 2. If you are going to get a college degree, it helps to delay starting a family. 3. Smart people still have sexual drives. 4. If you don’t want to wait till you are in your mid- to late- 20s to start having sex, but aren’t ready to settle down, you have liberal attitudes about sexual behavior, birth control, and abortion. On the other side of the coin, if you are not going to go to college, and you want to have a family early, you don’t want a lot of promiscuous people running around – available unattached sexually experimenting people disrupt monogamous families. Early reproducing women don’t want those “loose women” hanging around tempting their husbands, because that means less resources for their children, and a possible divorce. Early reproducing men don’t want promiscuous men lurking around, because they want to be sure that those children they’re supporting are their own.