In human society, there is also an individual who is neither a man nor a woman. Said that he is male and has the characteristics of women; Said she looked like a woman, but in fact she had the characteristics of a man. Medically, these people with male and female characteristics are called "hermaphroditism". There are not a few hermaphroditics. According to a survey in the United States, about 2,600 people are born in the United States every year. Due to the severe social reality, they are only recognized as male or female, so they will be operated soon after birth. In the United States, there are an average of five such operations every day, so that they can be classified as either male or female. People with hermaphroditism can be divided into "true hermaphroditism" and "false hermaphroditism". The distinction between truth and falsehood is judged according to the main gonads in the body. "True hermaphroditism" people are on the same person's body, with both male testicles and female ovaries. Both ovaries and testes in the body can have endocrine function, that is, there are estrogen and androgen in the body at the same time, but one of them is often dominant. The external genitalia are mostly unknown in gender, and may also be female or male, while the development of secondary sexual characteristics often depends on the dominant hormones. If estrogen is dominant in the body, the secondary sexual characteristics tend to be female. If androgen is dominant, the secondary sexual characteristics tend to be male. This kind of vulva has a smaller penis above the urethra and two separate labia majora below. There is a small opening between the two labia majora that seems to be a vaginal opening, but it is actually a place to urinate. This true hermaphrodite will have both male and female characteristics at the same time, with full breasts, erectile penis, sometimes nocturnal emission and no beard. If as a woman, the vagina is shallow and small, and the uterus is very small, so there is no fertility. However, it has also been reported that people with reproductive function have been found. The difference between "pseudohermaphroditism" and "true hermaphroditism" is that there is actually only one kind of gonad in this human body, either male gonad or female gonad. For those with male gonads, the appearance of their external genitalia is female; The appearance of the external genitalia of those with female gonads is male. As a result, there are pseudohermaphroditics who look like women but are actually men, or look like men but are actually women.