Neither gender is routinely more jealous - although women are more willing to work to win back a lover, while men tend to flaunt their money and status and are more likely to walk out to protect their self-esteem or save face.

Blushing is thought to be linked to increased levels of norepinephrine in the brain, which may be associated with romantic feelings. It signals that we are interested and excited, which is attractive to men.

Women are naturally prone to compete over their mates.

Neither gender is routinely more jealous - although women are more willing to work to win back a lover, while men tend to flaunt their money and status and are more likely to walk out to protect their self-esteem or save face.

Women, it turns out, are built to lead - particularly in the modern world.

Psychologists maintain that the dizzy feeling of intense romantic love lasts only about 18 months to-at best-three years

Men tend to be hierarchical, but women are driven to make lateral connections so they can cooperate.