Where your date is looking can indicate whether they're assessing you as a romantic partner or lusting with sexual desire.

New research shows your gaze can reveal how you really feel.
A new study published in Psychological Science tracked participants' eye movements when shown non-erotic images of attractive people of the opposite sex looking directly into the camera.
Before you say "duh," the automatic judgment can occur in as little as half a second, so it might not be perceivable.
The effects was shown for both men and women. And when shown images of young couples interacting with each other, participants could suss out whether they were feeling romantic love or lust.
The researchers believe the brain can process both emotions quickly, and the eye-tracking can eventually be a new biomarker for psychiatry or couple's therapy instead of only relying on patients' self-reports.