How many kids do you have? Do you work full time? Commute? How is your general stress level? free time/obligations/priorities/finances/mental noise Does your desire level change during time off/weekends/vacations?
If you have a ongoing 'issue' with who initiates you can mentally schedule it. Desire is an ongoing issue for me, (I asked cemar for help with it one time and he declined) and most of my sex is 'scheduled'.