You don't need to Kiss

This morning Daddy was giving out the morning kisses to the kids while they were in the car. Lucky Mommy was last in line. After I kissed Daddy good bye and got in the car Alexandra said to me "Mommy - why did Daddy kiss you?" I said because Daddy loves Mommy. At that point, Alexandra got a very puzzled look on her face. She said "Mommy, kissing is only for people who are IN love with each other. You and Daddy are not IN love - you are already married, you don't have to kiss anymore." I just started laughing - I wonder if I could convince Daddy of this?