天生存在的其他性别
The Six Most Common biological sexes
XX – Most common form of female
XY – Most common form of male
X – Roughly 1 in 2,000 to 1 in 5,000 people (Turner’s )
XXY – Roughly 1 in 500 to 1 in 1,000 people (Klinefelter)
XYY – Roughly 1 out of 1,000 people
XXXY – Roughly 1 in 18,000 to 1 in 50,000 births