Jenny is joining...
Getting this out of the way: I haven't been in "love" before, but I have had crushes as everyone does...hey, I'm 14!!!
I believe that "love at first site" and such is chemical impulses. But as time goes on, and you grow attached and you get to know the other person, that is "Love." Once you are with the other person for an extended amount of time, or you get have everything in common, or it just...FITS, that moves beyond the impulses and chemicals. chemicals are still creating the "love" but it goes beyond that at the same time. its not just "lust" or anything like that anymore...you genually love the person...
just my thoughts...