Why do couple think of caste , Religion , parents consent and other such issues only when it comes to marriage instead of doing so at the time of falling in love?

This is simply because love is spontaneous and natural instinct whereas marriage is a deliberate decision based on caste, religion, status etc according to thinking of couples and other related persons/ society.

This is what even I never got the answer. May be in love person hides it from her/his parent but for marriage he/she knows it that there is no way they can hide it that's the reason they have to take their parent's permission.

In the beginning days of love, there will be a distance between man and woman. The distance will not allow them to see the things in true perspective.. With the time, as the love grows, the distance decreases, Its only then the things will come into focus.

Because love is part time job while the marriage is full time affair where they need to think seriously.

Love and mutual attraction is biological . It is the society that comes into the picture once the couple go through the initial phase of romance and think of getting married..

Love is not conditional but when it comes to marriage it makes us think about our future in many aspects and hence a lot of consultation is needed.