Matters relating to sexual desire are the number one presenting concern brought to the office of many sex therapists. I find that nearly as many women complain about not having enough sex, as do their male counterparts. In my sex therapy practice it is about 60/40 with the man being slightly more desirous. That said, it is often not about gender at all because we regularly see desire gaps in gay and lesbian relationships. This of course is the one time when we can say with certainty that it is always the man or always the woman! Gaps in desire can be related to a number of factors. Frequently the culprit tends to be rooted in physiology, pharmacology or psychology, and those are all great areas to explore. More often then not however the best pillow to look under is at the relationship itself. Good communication is a great place for couples to start working to close the gap.