Love can be scientifically explained, whereby the testosterone hormones lead one to develop interest in a person after noticing them. The second stage occurs when you're really in love and think about that person every other minute. This leads to the cortisol level to rise, thus causing you to experience incidences like dry mouth and sweating or trembling when you talk to the person you are drawn into. The vasopressin and oxytocin hormones then leads to the two of you get close to each other and stop fearing each other.
When you do, it take away all of the real romance from it, now doesn't it? All I care to know is that I've been in "it " for over 30 wonderful years, and that's all that matters to me! And I know it's going to take me all the way to the end! ;)