 There have been years of research that have established many principles of attraction, one being an experiment by Aron and his colleagues, conducted in 1989, that found that most people repeatedly mentioned reciprocal liking, personality, and appearance as factors that influenced them to fall in love.People are naturally more attracted to those who express positive emotions towards them and simply knowing that someone is attracted to them can induce this reciprocal interest.Reciprocal liking can be indicated non-verbally, such as through body languages (for example maintaining eye contact or leaning forward).