Love is an emotion, and emotions do not necessarily remain constant. No doubt, the first crush in life in unforgettable but that doesn’t, in any way, infer that this kind of emotion or feeling will not occur again in future.
We love the beloved or a thing at the first sight because something about that beloved or thing entices our hearts. But it is possible that we may find the same situation in future also. And, of course, we may feel the same crush again.
Then it also depends on the response we get from the beloved one. If our love goes unrequited, the degree of probability of having the same crush again is maximum.
It goes without saying that love is a natural feeling, and it may arise whenever we behold the beauty in different aspects. It’s not that we get enchanted towards only one aspect of beauty. At the same time we cannot get across the different aspects of beauty once. We may feel riveted towards one aspect at one time and towards other at any other time.
Therefore, I believe that love is a natural feeling and natural feelings or emotions may arise naturally without any definite rule or precision.