Two people with PhD's try to explain everything via evolutionary psychology:

Why most suicide bombers are Muslim, beautiful people have more daughters, humans are naturally polygamous, sexual harassment isn't sexist, and blonds are more attractive.

http://psychologytoday.com/articles/pto-20070622-000002.xml

1) Men like blond bombshells (and women want to look like them)

2) Humans are naturally polygamous

3) Most women benefit from polygyny, while most men benefit from monogamy

4) Most suicide bombers are Muslim

5) Having sons reduces the likelihood of divorce

6) Beautiful people have more daughters

7) What Bill Gates and Paul McCartney have in common with criminals

8) The midlife crisis is a myth—sort of

9) It's natural for politicians to risk everything for an affair (but only if they're male)

10) Men sexually harass women because they are not sexist