what is the factor of love???

Since this is my first life experience to write a blog, i would like to start with a subject that everyone in this world would like to talk about(unless the person has no feeling …hehehe)……which is …..LOVE. Before that please forgive me if i did any grammar mistakes and please correct it for me……..Well it is very complicated and confusing to talk about this matter…..but what to do ….we are all trapped in the word Love…..
i always have burning questions in my mind…………………..about LOVE..Actually what causes someone to fall in love with someone?What makes them to love others? What?What?What?What?What?…………………..Ehm do you have any idea????
But then i found that love can be categorised into many chambers like human heart ……but i think love is more complicated than that….For examples, love between parents,love between friends,pets,teddy bears,cars……and the most important one…….love love love between LOVERS…hehehe. My question is what causes a person to fall in love to someone? Are they sexually attracted to each other? Are they attracted to each other because they have similar or same characteristics or behaviours? Are they attracted simply because they are different from each other? Are they attracted to their personality or appearance? Are they attracted because they are affluent, smart, genius and so on??????
Actually do they really attracted to someone and then they call it as a love or they receive any “electric signal” from the opposite sex or simply because they fall in love and do not know whether it is love or not but make a decision that they are in love????/EHMMMMMMMMMMM…………………………..love is really complicated…………………………….IT IS undefined …………..clueless……………confusing…………………….but yet it is still a very very very very very sweetest feeling that you ever had in your life………………:)