He's trying to "wean" himself off sex, and he's trying to USE her to do that.
She does not have to participate in ANYTHING for him to do that if she does't want to, and it sounds like she doesn't. He's being totally selfish, and he's an adult. He can wean himself off by himself, like a big boy! It's time for him to "man up" and stop using her for his own pleasure or his own "use."
Obviously nothing sunk in. I guess you're going to have to hit him over the head before he "gets it."
Your marriage vows didn't say "I promise to be used."
God bless and please take care. Hugs, Lee