The magical biological and psychological chemical attractions to which we humans are heir is one of the more complicating, exciting, bewildering, and painful parts of life. Desire.
Sexual and romantic tension between two people is powerful stuff indeed. Without it, there would be very little music.
The French, like the cave-men did, routinely give in and just get the thing over and done with. Magic gives way to reality fast, in relationships that last longer than a few hours or weeks.
I wonder how our readers deal with this part of life, but I am not trying to collect Lenten confessions...