In TV & Radiofollow-up:
Are men and women's brains wired differently?
A new BBC One series delves into our minds to find out how we think and fall in love.
Sex ID test
Can a burly builder have a woman's brain? Investigate your brain sex with Sex ID – the survey featured in Secrets of the Sexes.
Look into my eyes
The Sex ID survey tested the theory that women are better at correctly interpreting facial expressions, on average.
Fake smiles test
Test your ability to spot a fake. Or try our other psychology tests.
If you want to be happy, tell your amygdala to keep quiet. Use the brain map to find out where your amygdala is and what it does.
Madly in love
Events occurring in the brain when we are in love have similarities with mental illness. Find out more about the science of love.
First shown July 2005
Brainsex - Programme 1
Attraction - Programme 2
Love - Programme 3
The science of pullingResearchers say it's best to flirt with body language and a smooth voice.
Personality testAre you a Big Thinker or a Mastermind? Find out if you're one of 16 distinct personality types.
Science proves love is blindWe suppress brain areas used for critical thinking when we're smitten.
Love in the labScientists say they can predict marital happiness with 94% accuracy.
Love and drugsListen to a radio programme that asks if chemicals can solve love crises.
Relationship helpGet tips to improve your relationship from bbc.co.uk/lifestyle.