Don't forget about YOUR needs. Make sure you are happy as WELL as your husband.
Duty sex should only be done sparingly, as duty sex leads to sexual aversion.
Initiating Sex: This is the single greatest gift you can ever give a man. It will boost his self esteem more then anything else in his life. HD men want one thing in life above all else, and that is to be desired. Read the posting I did about "What men think about sex" from yesterday.
I would suggest you get the book by B. De Angelis that explains what men want women to know about men. It explains HD men PERFECTLY. It also tells women how to be the PERFECT mate for such a man. I will warn you though, for a LD woman, this can be scary reading, as it will be a shocker to LD woman as to what is REALLY required in marriage to a normal male.