Have you ever considered having that honeymoon? I mean, plan it out as if you were twenty-somethings, plan out what you will do for fun, romance, sex, adventure - the whole kit and kaboodle. Working on this together, (take him out for a candlelit dinner alone to get his attention) might get the spark started.

There are also couples workshops available, that are more about learning how to be playful than theraputic. Something like this might give you a boost.

Also, learning to be happy with yourself and giving him the gift of a truly happy and fulfilled woman might be just the ticket to happiness.