Adam saw Eve and immediately said "Wow!" The difference was Eve was a one of a kind; there were no other women. However that doesn't meant that it can't happen. Today most people will tell you that the "Wow" reaction is not love. I disagree. I have met people that have met like that as well as people that haven't met like that. Neither side is more successful than the other although the "love at first sight" couples are met with much more resistance from others. Culture today will accept a couple that was living together for 2 years before getting married more than a couple that married 3 months after meeting one another. It's a shame that culture supports the longer you "test drive" a person, the more success they will have.
When Jesus and John were in the womb, they lept in the wombs when coming near to one another. People also do this in their spirits as well. Most people are just not aware of it and even fear this response for a lack of understanding it. Love is not only the initial reaction though, it is the follow up. Love endures all things. To say "well, they didn't stay together cause they only knew one another for a few months before marrying" is foolishness. A different excuse is needed for the two that knew each other for years. The fact is, failure in either case is a lack of "enduring ALL things".
We need to teach people (especially our children) how to end the selfishness and begin to walk in love.