Our pupils unconsciously respond to psychological stimuli such as when we are turned on by something or someone. Pupils have been found to dilate slightly in response to such stimuli that can be exciting or interesting including when we are looking at someone we like or are attracted to.

This involuntary visual reaction allows the eyes to take in more light to better process the visual information in front of us. This dilation is also an indication that our autonomous nervous system (that controls involuntary actions like breathing, etc.) is prepping up in response to the visual stimuli.

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