Any kind of novelty or excitement drives up dopamine in the brain, and dopamine is associated with romantic love.

Women spend their lives trying to look good for men. So a woman who feels she's sending the right visual signals is pleased with herself.

The Great Depression of the 1930s saw more American unmarried women working from nine to five, mostly in repetitive, boring, subordinate, dead-end jobs. But the number of working women doubled between 1870 and 1940. During World War II it doubled once again.

You size up someone physically in less than one second - too tall, too short, too fat, too thin, too old, too young, too stuffy, too scruffy.

People compose poetry, novels, sitcoms - for love.

Keep an open heart. We are wired to find love.

For so many generations, a woman's only career path was to marry well and to marry up. Those days have changed.