Have you tried little seductions ... like sitting at his feet while he's watching tv and playing with him (that does it for me); or, waking him in the middle of the night with a little oral action. Or if you want to be really creative, rent a hotel room and ask him to meet you there like you were his "pick up."

One I used to like my wife doing was to leave sexy little reminders in my lunch sack ... little notes ... one time a pair of panties. Little fun things like that.