When scheduling sex is necessary, most often one person could take or leave sex entirely, for many reasons, including marital dissatisfaction, low hormones, monotogamy, poor body image, sexual side effects from medications, or anything else. If the higher sex drive partner openly acknowledges (via empathy) that it’s tough for the lower sex drive partner to have sex at all, rather than seeming disappointed with the need for scheduling, then scheduling sex goes a lot better.