Not to get too graphic here, J, but will he allow you to perform oral sex on him? That might be a way of keeping him bonded/connected, although I know it doesn't do much for your own needs. Some guys do get into that funny space where they can't see you as a sexual object when you're really pregnant - hopefully that won't extend into after the baby is born.
You also might try seducing him in the middle of the night when he's asleep - once he wakes up aroused, he may not be as inhibited.
