"Then what did you come here for?" Professor Eichel asks, echoing Jade's thoughts. Jade idles by the side of the bed, waiting to see what would happen. He doubts he'd like the result, but...

It isn't really a matter of what he likes or dislikes. This is just business. He's minimizing distractions by satisfying his body's urges, and at the same time gaining knowledge that he needs.

It's just a matter of logic.