I figured it out for you, man. Tell her you're into fantasy/role-playing, and you want to act out a murder/rape/robbery scene that you have envisioned. It goes down like this: You're walking home at night by yourself, carrying a couple pizzas, ready for a quiet evening at home. Out of nowhere, someone jumps out of the bushes, stabs you to death, and runs away. Shortly after you bleed to death, a chick discovers your corpse and has the inescapable urge to jump your bones. She fucks you, then leaves, and shortly after you're discovered by the cops.
How you enact this role play is that you set up a time for her to come over to your place to be "the rapist." An hour before she's due to show up, you pop enough Xanax to pass out, plus some Viagra to give you a hard on. She "discovers your lifeless corpse," and rides your rigor mortis to ecstasy. The crucial part here is that she has to leave your house right after she fucks you, because she doesn't want to get caught by the police.
If she's not too keen on fucking you while you're passed out, tell her that the robbery part of this murder/rape/robbery is that she gets to steal the two pizzas you have for her in your fridge. Boom! You just got laid!