WARNING: I wrote everything past the first paragraph quickly, and did not check it. If I'm being stupid, please say so.
The definition of "love at first sight" needs to be addressed before actually arguing it. Love at first sight tends to be a retrospective term used by married people when they want to act obnoxious. I've never heard of a couple that have just met and would say "I love you" in such a manner as the word's weight actually requires (people use the words love and hate way too often, it's diminishing their values). The deception with this term is not one of mistaking attraction for romance (though that is still a common misconception), but that of mistaking a good relationship with kismet.
Note: While I do try to explain why romanticized relationships exist currently in the following paragraphs, I am not advocating the forcing of ideals onto people, nor am I advocating harmful behavior towards anyone.
If this discussion is meant to cover sudden attractions upon meeting one another, then yes, that is entirely biological and sociological in nature. However, that is not to say that finding what one desires in a mate (and is able to maintain a happy, healthy relationship) isn't any less improbable or pleasing to those involved, if we bring the psychology of math into this. Firstly, there is one's sexual orientation. Under the assumption one is one orientation or the other, a huge chunk of the world's population has just been excluded. Then we factor in sociological factors, such as definitions of beauty, social structure for dating, and mutual acceptance. Psychological factors come in to play throughout the entire relationship, that either aid or sabotage a relationship. Add in the fact that despite the society being more connected in communication than previously dreamed thirty years ago, an individual's ability to find someone s/he likes, let alone communicating with so further courtship can occur, is also a factor. Then there is the chances of a relationship being able to maintain itself, which is a statistic that grows more grim by the day. After using said factors to narrow choices down, the chance of a happy, long-term relationship is actually quite difficult.
This, I think, is why it is romanticized. Seeing these odds, a certain mysticism is believed to have occurred, whether or not actual mysticism exists. Psychologically, I believe this is much like how a gambler sees a winning streak after winning a decent hand, or a losing streak after losing many hands. We see odds defied, and believe that we are special, not aware of the fact that odds are indifferent to everyone, and are at their heart entirely random despite any amount of trials.
Of course, there is also the psychology of a romanticized relationship. I don't know about anyone else, but I cannot simply think "Okay, adrenaline, start pumping!", nor can I decide to instantly go into REM while napping in the middle of class. Psychology working in tandem with the body is essential to the rest of our functions. When unarmed and near a bear in a forest, one would naturally start to feel nervous, even if the bear is too far away to notice the person. This is due to the fact that we know, subconsciously, that bears are very effective killers, and a sane person untrained in training bears would not want to be discovered (which would lead to a possibility of death). We also want to drink water because we know it hydrates us, which is essential to living. Likewise, we add a romantic view to love, attraction, or whatever one wants to call it. It drives one to treat one's mate in a special manner, in hopes of said treatment being reciprocated (and of course, to try to pass one's DNA). Furthermore, since one of the sources of impotence is psychological in nature, romanticizing a relationship (among other factors), allows one to be able to pass one's DNA.
Also, I have a theory as to why the romanticism of relationships is allowed, despite (at least a percentage of humans) are rational beings. If we consider Jung's Collective Unconscious, then we figure the following:
- As a society, we want to live.
- To live, we need genetic diversity, a sufficient amount of people passing their DNA, and avoiding over-population.
- So, as a society, we strive towards the aforementioned factors (and more, since I'm simplifying).
AND
- To have aforementioned factors enforced, there needs to be a way to enforce it.
- If there needs to be a way to enforce it, sociologically and psychologically methodology are the best non-violent means to maintain a healthy population.
- To have aforementioned factors enforced, sociological and psychological methodology are the best non-violent means to maintain a healthy population.
This would explain human norms such as monogamy (to prevent over population and accidental inbreeding), courtship (sexual selection is just as prevalent as natural selection), and the high psychological importance placed on these.