Most popular notions about the male brain are based on studies of men ages 18 to 22 -- undergrads subjecting themselves to experiments for beer money or course credit. But a man's brain varies tremendously over his life span, quickly contradicting the image of the single-minded sex addict that circulates in mainstream consciousness.
From his wandering eye to his desire to mate for life, here's what you need to know about guys' minds.
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