Oral problems?

I'm not really into giving my boyfriend oral. We've done it to each other in the beginning of our relationship, but not as much anymore. I just avoid it because it doesn't turn me on, he doesn't trim often at all, it doesn't smell pleasant, don't like how I can't tell if he likes it or not (although he told me it's great), and doesn't taste good at all. Is this ever going to change? Is it his unhealthy diet and bad hygiene getting in the way?