how i remember those days not a night without sex and loving,it just flies out of the window after a while,its because you are both content with each other and knows that you will always be there and have each other,i tend to do my husband and myself romantic meals in the house and then dessert in the bed it is always a winner.
I agree with teddy, however sex is 75% mental and 25% physical. Work on the mental. Take charge and seduce him. Book a hotel room but don't tell him. Take him out to dinner and rinks and drive him to the hotel room. Spice it up and this should help.
I think it is because you have passed the honeymoon stage. This happens to all couples, believe it or not.