Hey babe, I know you have not been feeling very sexy lately. Does that mean that you have not been feeling attractive to yourself or to me? I understand how one cannot feel attractive, but it is a strange trick to play on one's self. If you sat on your hand for a long enough time to make it dead, and then punched yourself in the nose with that hand, you might be tempted to blame that hand for it's intended harm. In the same way, I think you are tricking yourself to not feel attractive, because you do not know that you are responsible for your own self-perceptions. Secondly, you cannot control how I feel about you. You could try and make yourself more sexy through great external expenses, but you know that their is nothing more unattractive then falsity. Confidence is the great attractor.
I just want you to know that you are responsible for your own self-perceptions. To become dependent on another's opinion is to be a slave, like an addict who cannot live without externally induced pleasure. You could either remain a slave, or you can take charge. You can try and foster some kind of everlasting optimism, but what goes up must come down. Or, what I would recommend is to practicing having no opinions about self at all.
You might feel that because we have entered into a deep relationship, that my opinions about you are most important, but I would argue the contrary. When our relationship became a spiritual aknowledgement, it became, I would argue, a safe-haven not for the ego, but for the soul. Within the bounds of this relationship we have the freedom and the understanding to drop expectations, drop opinions, and practice living without self. That is what the rings on our fingers mean to me.
However, I know that it is not practical in this life to go on uncaring about the opinions of others, especially as we are not perfect. I am trying to take it up as practice though, and prefer to take up relationship contracts, whereby one tries to meet the expectations of others, in the same spirit of play that children adopt when they do make-beleive. Kids take on characters and play roles, but drop them just as suddenly in response to being called in for supper. That is, that our expectations should not be laws. In a storm, the most unbending trees are the ones that always break.

Love
your boy