"I don't wanna be loved. I just want a quickie. No bite marks, no scratches, no hickies."
She didn't get herself involved in this for love. It was purely lust. Nothing more than that. She just wanted somebody to make her feel wanted, and he wanted to make her feel that way, so of course she agreed.
But.. of course, she had to expect the unexpected, and she ended up doing exactly what she didn't want to do.