By Elizabeth Cohen
CNN Medical Correspondent
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(CNN) -- Close your eyes for a minute and envision all the romantic parts of the human body.

Her beautiful eyes. His strong shoulders. We'll stop there, but you go right ahead and think about all the body parts you want.

Bet you didn't think about the caudate and the ventral tegmental areas, did you?

These areas of the brain, while little known to most people, are helping scientists explain the physiological reasons behind why we feel what we feel when we fall in love.

By studying MRI brain scans of people newly in love, scientists are learning a lot about the science of love: Why love is so powerful, and why being rejected is so horribly painful.

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The women's brain activities were a bit more puzzling.

The scientists found that women in love had more activity than men in the areas of the brain that govern memories. Dr. Fisher theorizes that this is a "female mechanism for mate choice." There are no visual clues for whether a man is fertile, but if a woman really studies a man and remembers things about his behavior, she can try to determine whether he'd make a reliable mate and father.

Thus, if it sometimes seems like a woman remembers everything -- good and bad -- about a man, "it's not just her being picky. It's an old Darwinian evolutionary strategy."