It's hard to pinpoint what distinguishes a gorgeous face from an average one, but some researchers are getting pretty close. Psychologist Dr. Lisa DeBruine of the University of Aberdeen in Scotland says she's found that women's faces get more attractive to men when they are ovulating. "We're not entirely clear why there's this difference, but we think that the women might look healthier, have a bit of a healthier glow when they are ovulating."
Symmetry is another factor that determines a face's attractiveness. Dr. Kendra Schmid, an assistant professor of biostatistics at the University of Nebraska Medical Center, says there is a formula for the "perfect" face. She uses 29 different measurements to determine someone's appeal on a scale of 1 to 10.
To start, Dr. Schmid says the ratio of the length of the face to the width of the face should be 1.6, also known as the golden ratio. "The face should also be divided into three equal pieces vertically," she says. "The forehead, then [the bottom of the forehead to] the nose and then from the nose to the chin."