Can anyone tell why people fall in love?

love is in our genetic makeup.it is an emotion we all feel from an attraction to the other sex.a feeling we have most often when we are lonely and have a desire to love and be loved.we all want it and yet sometimes we dont.but it is in all of us and usualy shows when the person we are interested in shows even the slightest affection to us.

caz we are so stuiped, so fool and we want cause pain 4 ourselves and 4 the ppl we love.......this is the truth

I think that one of the best explainations for why we fall in love is in Harville Hendrix's book, Finding the Love You Want.  

samiha,

People love for many reasons, now days instead of asking people "do you love me" make sure you act "why do you love me". People love for looks, money, and for what you have, such as houses, cars, clothes, and sex. You have to investigate why people love you, when they say that they love. People have forgotten what love really is. Love is eternal. It is not limited by time. When you commit yourself to loving someone , you make that commit to all the person is. Not for anything else.

Well, It has been said that it's just one damn fool chasing another. Or for lack of a better discription, Lets call it Genital- Attraction.