Satoshi Kanazawa, an evolutionary psychologist at the London School of Economics and Political Science, poses the theory that the more intelligent people are, the more likely it is for them to adopt evolutionarily novel preferences and values in response to the challenges of the times.
Kanazawa says that humans are evolutionarily programmed to be conservative - to care mostly about family and friends, to believe in a supernatural power or God because of their paranoia about what they perceive as "unnatural" phenomenon, and, for men, to be polygamous.
"General intelligence, the ability to think and reason, endowed our ancestors with advantages in solving evolutionarily novel problems for which they did not have innate solutions," says Kanazawa. "As a result, more intelligent people are more likely to recognize and understand such novel entities and situations than less intelligent people, and some of these entities and situations are preferences, values, and lifestyles."
H/t to Humorzo