lol its impossible to have no ass.. however it isn't impossible to have no boobs.. If you want her to get away from you, do something that'll make her leave you alone. Even just saying "leave me alone"
ok.. once I was being followed by this HB0 (who was actually taller than me) I was just like "you think I'm a nice person, well I'm not. infact im going to walk away from you right now." and that worked pretty nicely, until the next day where she was like "if I didn't have a boyfriend I'd be going out with you" then I was just like "I have to go" so I got up and left the room...
she didn't bother me again after that. =)
so just do what you gotta do man, even if you're mean to her it's actually better for her in the long run to have her think about you as a jerk, which I assume she wouldn't like if she was taking your blows.