Forbid him to see you naked, or any part of your body under your lingerie for a long period of time (a month or longer). If she is naked, the lights must be off or he must be blindfolded; but he can absolutely not see beyond her lingerie under any circumstance.
This a subtle form of denial that will drive him crazy. Get him used to the idea that he’s not entitled to that unless he earns it…. Then make it very difficult for him to earn it.