Just a random bit of advise/facts, whatever. One thing to remember is that "traditionally" men are most intrested in sex during the hours around 8am, while women are more intrested in it around 9pm. Not that it applies to everyone, but as people get older they tend to conform more and more to this "fact."

Another thing you guys could try is reading some women's mags. You know Cosmo, etc. Just to get some female directed ideas about new things to do and how to impliment them. Also like everyone else said, don't goto her with the idea of the goal being sex. Just have the goal being closeness and "cuddliness."

If you must discuse the issue directly DON'T do it in the bedroom. Bring it up gradually when you will have plenty of time to talk about it, but also be willing and ready to give her some space if it doesn't go very well.