I believe that most love begins with physical attraction. It's the first thing about a person, we're not mind readers and are not able to instantly figure out the person emotionally. Physique is the first thing;thus with that we are able to almost predict a person's personality from face expressions, physical actions, and maybe clothing style. Unfortunately the way we perceive a person is somewhat stereotyping, living in a society where the image of a person and a person's action most likely predicts a personality.
If we are physically attracted, it automatically influences our interest. If we are turned off by a person's physical attraction, most likely we will not be interested in any further interaction.