tell her she's worth a nut, but you are against intimacy so there will be no mouth contact. This will let her retain her pride, and complete the lie for both of you.
Then, take her someplace, bend her over in teh back of your vehicle, pound the brown, go in the bar, order a shot of vodka and cover your genitals with it in the restroom. Then duck out the back door and leave her at the bar alone.
Some other dude will take her home. Problem solved. You conquered her anally, which is the goal of all men. you got away clean. She'll always see you as an asshole, ensuring she stays away but all her friends want you.