You need to talk to him about compartmentalising aspects of your lives.
So, on Saturdays, yo go out together as a couple for a meal or to the cinema, and you agree not to discuss work AT ALL.
You get a cab home, so you can have a drink each, you are wearing some new underwear, which you show him discreetly, and let nature take its course.
Then, say you are going to do this regularly - you don;t expect the evening to always end in sex, but you do expect a nice cuddle and some kisses, and NO TALK ABOUT WORK.
Try it - this could be the key to getting your lives back.
Good luck.