Here's the link to the article:
http://www.cnn.com/2010/HEALTH/02/26/liberals.atheists.sex.intelligence/index.html?on.cnn=1
This is the main idea
:
Evolutionary psychologist Satoshi Kanazawa at the the London School of Economics and Political Science correlated data on these behaviors with IQ from a large national U.S. sample and found that, on average, people who identified as liberal and atheist had higher IQs. This applied also to sexual exclusivity in men, but not in women.
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The Margarita Evolution