Laws of Attraction

What causes a person to be attracted to another person?? For a long time I wondered what caused this, I pondered the idea and threw it up and down till I came up with a few ideas. First off we all have our own interests in life, things we like and this can be one cause. When we see someone else displaying like interests this can promote attraction to that person the movie height Fidelity John Cusack's character says, "Its not what we are like but what we like that attracts people,"one of my favorite movies/book and a great quote. Another reason, the most obvious reason of all is looks, if the girl is hot us guys are going to be attracted. One of the best reasons I have found and I can usually associate this with everything is mystery. If the girl is sweet, has a nice smile, I find her attractive and seems intelligent but hardly ever speaks I find that mysterious as hell and it makes me want to know more. Some girls just have that effect I guess, a sense of mystery with hidden depth that just beckons you to want to find out more.
So what causes u to be attracted to someone else??