Eye movement studies show we look at different parts of other people’s faces depending on the situation and level of attractiveness.
When looking at strangers or in business situations, we make a small triangle by moving our gaze from eye to eye, dipping them only slightly as we move across the bridge of the nose. With friends or in more social situations, the triangle widens as our eyes drop below eye level to include the nose and the mouth.
However, with lovers and people we fancy, the triangle broadens even further, dropping below the mouth to include the breasts and other good bits like the genitals. The more intense the flirting, the more concentrated the eye contact becomes at certain parts of the triangle. Eye to eye contact becomes fast, furious and constant, seconded by long periods spent staring at the mouth. Our eyes spend the rest of the time making little side journeys to the bits at the bottom of the triangle.