For example, the Swedish psychologist Mikael Landen discovered that there are three genes present in transsexual males that make them less sensitive to testosterone, the male hormone that stimulates the development of male sex organs. He uses this theory to explain why transsexuality can't be cured, and why there are people with transsexual tendencies in every society.
例如瑞典的精神病學家拉登，發現變性慾男子體內有三種基因，讓他們對睪丸脂酮較不敏感，並以此來解釋何以變性傾向無法導正治癒，而每一個社會都有變性傾向的人存在。