Luke is threatened by his sex transformation, his arousal by an attractive male, and the questions of sexual identity it raises; he seeks help from Sydney. She tells him that a zerophiliac can become "a-morphic" and stop changing sex only by having sex with another zerophiliac... such as herself. He reluctantly agrees to do it, but discovers afterward that she was not telling him the full truth: an a-morphic zerophiliac can still change by having sex with another zerophiliac, and Dr. Catchadourian was using Luke to change herself one last time (into a man), leaving Luca as a woman in the process.