If you often sit on a train pondering how the rail networks are co-ordinated then you are more likely to be male, new research suggests.
Likewise if friends often come to you with their problems, then chances are you're a woman.
In the biggest ever study examining differences between the sexes, scientists have concluded that women really are more empathetic, while men are more analytical and logical.
Researchers at the University of Cambridge tested more than 680,000 people and found that on average women have a greater ability to recognise what another person is thinking intuitively and respond appropriately.
On the other hand, men have a stronger drive to view the world through "rule-based systems", striving to learn how things work through their underlying parts.