Loving with all your ... brain - CNN.com:
Is it love -- or sex?
Scientists then wondered: Does a brain in love look much like a sexually stimulated brain? After all, we associate love and sex and sometimes confuse them.
The answer is: Brains in love and brains in lust don't look too much alike.
In studies when researchers showed erotic photos to people as they underwent brain scans, they found activity in the hypothalamus and amygdala areas of the brain. The hypothalamus controls drives like hunger and thirst and the amygdala handles arousal, among other things.
In the studies of people in love, "we didn't find activity in either," according to Dr. Fisher, an anthropologist and author of "Why We Love -- the Nature and Chemistry of Romantic Love."