More at http://philosophytalk.org/shows/unconditional-love.

According to Corinthians 13, “Love is patient, love is kind and envies no one.” But is love always unconditional? Should it be? If unconditional love means that we love no matter what our beloved’s actions or traits are, doesn’t that suggest we should love everyone in this way? If not, how do we select just a few to love unconditionally? Perhaps the feeling we reserve for those we cherish most in the world is better described as selfless rather than unconditional love, in which case we are confronted with another challenge. What happens when our beloved changes radically and loses the very features that caused us to love in the first place? John and Ken talk unconditionally with Lynn Underwood, editor of "The Science of Compassionate Love: Theory, Research and Applications."