My wife hates oral

Is this normal? As far as she is concerned, her vagina is gross (its not) and the only thing that should go near it is my penis. She doesn't want me to finger her, she doesn't touch herself, and sexually she is pretty vanilla. Once in a while she lets me go down on her because I enjoy it, but the whole time she wants me to stop which kills the vibe. And before you go and tell me that I'm bad at oral, all my previous partners will disagree with you since they enjoyed it.