My bf dick smells!

I've been going out with my boyfriend for a few years now. I have such a hard time trying to suck his dick or pleasure him. He is uncircumcised. I have showered with him, he does clean and pull the skin back. But it still smells. I have sucked his dick before when we first started dating but now as I'm older i am more disgusted of smell and I also have a sensitive smell and stomach. I'm afraid that I won't suck his dick for the time that we are together because of this problem. He says he's satisfied with just having sex but I feel like this will cause a problem for our relationship in the future. Advice or opinions?