Talk to him. Tell him it would really turn you on if he did "X, Y, Z"
My ex was like this a LOT of the time. I will be frank here (lol) .... I loved to give him oral sex, but he NEVER reciprocated. Usually afterwards we would have penetration and it was great, but I started feeling really left out, as I seemed to be the one doing 99% of the "work", as it were. He would initiate but then just lie there expecting me to do everything, ALL THE TIME. A few times we hopped into bed and he pushed my head down to his groin and I felt like a bloody slave.
So I told him what I wanted him to do. He did it, and it was amazing. He could see how excited it made me. He did it on another occasion. And that was IT. I never asked him again, as I though, bloody hell he KNOWS what I like.
Truth is, he was using me, and as the relationship was broken on many other levels and sex was the only thing left that made it worth even seeing him, if I am truly honest, and it was long-distance... I ended it.
Then he had the audacity to say I used him for sex.
Lol... sorry I hope I have not hijacked your thread. You need to talk to him though!!!