Jeffo, I don't think it's about low libido. In my opinion sex is more about attitude than libido. Unless you have a physical problem that causes lowered hormones then any lack of interest you feel is based on your attitude toward it.

I have a good friend named Sally. Her husband is Dan...when she is playful she calls him Danny. Sally is not all that interested in sex but knows that it is important to Dan. Two times a week Sally gives Dan some extra special treatment. She puts a lot of thought and effort into it. A bubble bath with candles or a new sexy outfit for his eyes only. She doesn't go to all this trouble because she is all that interested in the sex, she does it because she adores her husband, works at understanding what feeling wanted means to him and acts in a way that allows him to feel wanted. She told me that those nights were more meaningful to her than the nights she has multiple orgasms because she is doing something special for her "Danny." She is giving to him out of love and in giving like she does she gets so much in return.

Sally has a good attitude. She knows she isn't going to be in the mood every time but she also knows that loving another person means giving at times when you don't feel like giving. To me it seems like the natural thing to do.
Cathy