The Zentraedi had always been rigidly segregated by sex, and most of them found the thought of fraternization disquieting to the point where it had been known to make them physically ill.

• 天顶星人一直被刻板的按照性别分开，他们中的绝大多数人认为待人友善会让他们烦躁不堪，他们甚至会因此引发生理上的疾病。