If a woman is attracted to a man her pupils will automaically dilate and he is likely to correctly decode this signal subconsciously without knowing it.
This is why romantic encounters are most successful in dimly lit places because everyone's pupils dilate and create the impression that couples are interested in each other.
With few exceptions, the men perceived the women with the larger pupils as being more attractive and friendlier than the same women whose pupils appeared smaller.
Hess discovered that the pupil enlarges when someone looks at something that stimulates him or her.
When someone looks at uninteresting or personally unpleasant things, perhaps war scenes or disabled people as examples, the pupils contract.
Much of our face-to-face time with people is spent looking at their faces.
The signals they send out with their eyes play a vital part in revealing their thoughts and attitudes.
When lovers gaze deep into each other's eyes, they are unknowingly looking for pupil-dilation signals and each becomes excited by the dilation of the other's pupils.
Research has shown that when pornographic films are shown to men their pupils can dilate to almost three times their size.None of the men remarked on the difference in the size of the pupils.Retouching photographs of male and female models for print advertisements is common practice.Establishing and maintaining eye contact comfortably with another person can be the basis for successful communication, giving you and the person you're communicating with a feeling of wellbeing and trust.Sometimes, eye contact can be uncomfortable though, such as when the other person seems dishonest, untrustworthy, or angry.Research shows that most women's eyes dilate to their extreme when looking at images of other mothers and children.