Love does exist. About this time of the year more than two thousand years ago, Jesus was crucified out of love to save us. True "love" has been defined in the Holy Bible:
4 Love is patient, love is kind. It does not envy, it does not boast, it is not proud. 5 It does not dishonor others, it is not self-seeking, it is not easily angered, it keeps no record of wrongs. 6 Love does not delight in evil but rejoices with the truth. 7 It always protects, always trusts, always hopes, always perseveres.
Human beings have evolved in such a way that the male is directly involved in raising his offspring. And clearly this is more likely to happen if there is something which forms a bond between the male and the female, so the evolutionary process has produced that too. Some aspects of that bond are what we call "love" (as shown for example in JiaPei Jen's post), and sometimes the word "love" is used as a shorthand term for the pair bond, but as often happens the word is a complex cloud of concepts and relationships which isn't subject to simple definitions.
In most of the movies it is shown a good looking guy falllng for a good lookin Girl and vice versa..Why aint a good looking guy fall for some ugly looking girl or vice versa ..I guess its Pure attraction of the opposite sex and we just want to frame it for Love.