Ive heard that a lot of women don't like to do it, and i've also heard a lot of woman do. I don't understand why, as it just seems like something nice you can do for you partner. And no, I dont have a problem preforming cunninglus for my girlfriend.
But for a physical relationship, I think oral sex is important for both partners. I think it's a nice thing to do for a partner, and even if they don't totally enjoy it, it's still nice to do those things.