By the way . . . . Your feeling like a parent to John and enforcing "Marital restriction" go hand in hand. What a way to punish the little boy in him!!
Do yourself a favor in your marriage (and also to save his self esteem) If you don't feel like making love, make it an "I" statement.
"I" don't feel well about us right now.
"I" am not feeling romantic.
"I" am going to sleep right now.
"I" need time to think about us before I can even think about making love.
Then it is about your feelings, and there's no need for the word "You" when talking to him about the relationship.
. . . just some word of advice from a long-time (twice) married woman.