Esther Perel, author of Mating in Captivity, has profound and important things to say about relationships and sexuality. Anyone who is in relationship, hopes to be in one, or works with people who are should benefit from reading her book. Here's a brief interview excerpt:

If sexual desire has subsided in a long term relationship, does thi s always mean that the relationship is in danger?

There have been all kinds of ideas about how sexual problems are usually the result of relationship problems and that if you fix the relationship the sex will follow. My experience is that I was seeing more and more couples coming in to my clinic saying that they loved each other very much but were having no sex. I feel that it wasn’t a lack of closeness that stifled desire, but too much closeness; that the very familiarity inherent in intimacy numbed desire. This is the first time in history that couples are invited to sustain a sexual life that is routed in desire and not in reproduction or female marital duty.

Go here for the full interview: