Valentine's Day special: Together forever

Valentine's Day special: Together forever
14 February 2009 by Graham Lawton
OF ALL the pebbles on the beach, why does one of them end up being the one you want to keep? "Nobody really knows why we fall in love with one person and not another," says anthropologist Helen Fisher of Rutgers University in New Jersey, an expert on the biology and psychology of love. "But there is a thing called chemistry."
Nobody knows why we love one person and not another
So what is "chemistry"? Some of the factors are well known: we tend to go for people who are our equals in terms of intelligence and looks, with similar backgrounds and values. But Fisher believes these are not enough. "You could walk into a room of people who are all equally intelligent and attractive, but one of them would still be the one," she says.
"Factors like intelligence and shared values are only half of the puzzle," Fisher reckons. The other half, she says, is how your biology influences who you fall in love with.
A handful of biological traits have already been linked to mate choice. We know, for example, that people seem to be attracted to those with a dissimilar immune system (New Scientist, 20 December 2008, p 60).
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