The most fascinating theory about eye gaze is that just the act of doing it can enhance, or even initiate, a feeling of love. Most of the time we think that our faces reflect what’s going on inside our heads, but, at least for some people, the expression on their face becomes a genuine feeling. … The facial feedback hypothesis was borne out in experiments at Clark University and the University of Alaska. At Clark, more than seventy opposite-sex strangers, under the pretext of an ESP study, silently gazed into each other’s eyes for two minutes. Participants who were previously assessed and known to respond emotionally to their own facial expressions reported a significant increase in passionate love for the strangers in whose eyes they had gazed.
Jena Pincott. Do Gentlemen Really Prefer Blondes?: Bodies, Behavior, and Brains - The Science Behind Sex, Love, and Attraction. p. 5