Or are those two things separate from each other? If she has a shitty personality, that would probably turn you off from dating her (or not), but would it turn you off from simply fucking her? I'd like to hear your thoughts. Show an extent to which that would be possible, or whether you feel sex would be more/less/equally enjoyable as a result of your shifted perception of her character.

"Shitty personality" is up to you, whatever you consider shitty, maybe being rude to people, zero patience, being a bummer, etc.