The raised brows, parted lips, flaring nostrils and wide eyes give the whole face a friendly "open" expression.
Related: Boost your confidence with better body language Deliberately extend it for up to one second and you've drastically upped the chances of him getting the message you're interested.
If he likes what he sees, his lips will automatically part for a moment when your eyes first lock.
Often an involuntary and obvious signal, flushing or blushing is the body’s way to mimic the effect of orgasm.
The tradition behind women wearing blusher and lipstick is a nod to this.
Valentine's Day is just around the corner, and dating is sure to be on Londoners' minds.