Who Needs Sparks?

I was at a back yard party last night after the 311 concert at Memorial Park.  We had a bonfire going and it was late into the night when I heard what to me was the most absurd thing I had ever heard.  A young gal in her early twenties makes the statement that she broke up with her boyfriend of  2 years because she met a new guy at work.  She no longer had the "sparks" for  her old guy and so jumped on the new one.   I rolled my eyes in the firelight and kept my mouth shut.
 
For some time now, it has been known to science, that when two people are attracted to each other their brains release chemicals that make them have those "sparky" feelings.  After a period of two to three years those chemicals slowly subside and are replaced by chemicals that give us, supposedly, a more calm and relaxed effect on one another.  If you have watched enough cable TV in the past few years, specifically the TLC (Total Learning Channel) or Discovery Channel, eventually you would have also seen the shows on how kissing releases a chemical from the brain that induces a bonding between two people.  I always give the advice to friends that if they don't kiss their dates, eventually it will  go nowhere.  Is this sound advice? 
 
This all sounds way to clinical but I think in the long run it could help us all understand relationships and bonding better.  Yes, Love is an emotion but it is also a frame of mind and partially a chemistry project.  I think if we all had a better understanding of how these chemicals come and go we could have a better handle on ourown feelings and emotions and in turn our relationships.
 
With that all said, I have to leave in 15 minutes to meet a date for lunch.  Wish me and my theories luck.