[falling in love] is a genetically determined instinctual component of mating behavior. In other words, the temporary collapse of ego boundaries that constitutes falling in love is a stereotypic response of human beings to a configuration of internal sexual drives and external sexual stimuli, which serves to increase the probability of sexual pairing and bonding so as to enhance the survival of the species.
The irony of social vs. scientific discourse. Talk like that is a sure way to reduce a man's probability of "sexual pairing and bonding," and consequently the survival of evolutionist species.