TJT, I would suggest NOT being sexually intimate with him right now. He shouldn't be able to eat cake like that. Telling you he wants a D and then continuing sexual contact with you is not okay, in my opinion.
He fulfill his "primal needs" with self-gratification if he needs to. I don't think you are helping the situation or yourself in being able to GAL and work on yourself by continuing to have sex given what is going in. You can't sex him back.
M: 40 W: 37 T: 20 MR: 13 S13, S9, S4 BD: 1/29/18 Sep: 4/23/18 (I moved out) 8/24/18 I come home, she moves out
If you want to get out of the hole, drop the shovel.