A glance, a look, a smile, a brush, a touch, a blush, a flush, a tingle. These are the foundations of attraction. The brain perceives and the body responds automatically.
A stare, a glare, a frown, a scowl, a sidestep, a “cross the street” warning, these are the foundations of avoidance. The brain perceives and the body responds again.
Almost every living being has these instincts, usually well founded in meeting other beings. Most people, animals, all have the awareness of situations either pleasant or dangerous, with an innate knowledge of survival.