the best red lipstick for you

A study at the University of Manchester found that upon meeting a woman, the average guy will spend more than five seconds checking out her mouth. But this doesn't mean you need a Jolie-size pout to impress: in the study, even thin lips got attention if they were painted red.

"It's a classic colour that instantly awakens the face," says make-up artist Molly Stern. Use this guide to find your best hue.