My wife despises oral, period. Sometimes she will try to give me a blowjob, but it's so awful and I can tell she doesn't want to do it, so I would rather she doesn't even try.
She hates when I go down on her, which is interesting because once in a blue moon she will sigh and say, "Fine, go ahead", and she gets incredibly turned on and has the best orgasms ever, which she acknowledges, but she still doesn't like it.