Remove the obligation entirely. If sex currently carries a should, take the should off the table. This is not about having less sex. It is about making every sexual encounter a genuine choice rather than a fulfilled duty. When sex becomes optional again, it becomes desirable again.
Return to the body. Obligation lives in the mind. Desire lives in the body. The fastest way to shift from one to the other is to stop thinking about sex and start feeling. The I Feel Practice teaches partners to share raw sensation in real time: "I feel warmth in my belly." "I feel tension in my thighs." This is not foreplay. It is the practice of returning to the body so that the body can tell you what it actually wants.
Rediscover what you want. Not what you think you should want. Not what your partner wants you to want. What do you actually want? The I Want Practice trains the capacity to express desire without apology or performance: "I want to be touched slowly." "I want to feel wanted before I feel touched." "I want five minutes of eye contact before anything else." These are not instructions for sex. They are the practice of reconnecting with honest desire.
Stop performing arousal. If you are not aroused, do not pretend to be. Faking pleasure teaches your body that its real signals do not matter. Over time, the body stops sending those signals at all. Honesty about where you actually are ("I want to be close to you but my body is not there yet") is the beginning of real intimacy, and real desire.