Who wants to have sex with someone who doesn't show affection and love? It's not like it's someone that you have disconnected emotions with and that you are with purely for sexual reasons. It's your husband. Often women connect sex with love and vice versa, so we equate the two.
Love, desire and PASSION or the opposite unloved, undesired, no passion....unhapy, unloved, sad. All in the heart and emotions.