Is "Why do you love me?" a legitimate question to ask your partner?

Some people believe that trying to explain why one loves another person isn’t possible, or even that it’s shallow to do so. Others believe that you should have reasons for loving someone and that answering “why do you love me?” should be an easy thing to do.

How do you feel about it? Should you have some kind of idea about the reasons you love someone? Or does love not need reasons?