Bisexuality, also known as bisexuality, is a sexual orientation or behavior that refers to the tendency to have feelings of love for more than one gender (including males and females) and to be easily attracted to their bodies. It is one of the three main categories of sexual orientation, along with heterosexuality and homosexuality. Individuals who are not sexually attracted to either males or females are asexual. According to the National Sexual Health and Behavior Study, more women are bisexual than men and less women are same-sex than men.

Bisexuality can be found in various historical records of human societies, as well as in other animals [2]. The term "bisexual" was coined in the 19th century.

The genetics of bisexuality are at the psychological level, and the sexual objects or ways of satisfying sexual desires are different from ordinary people. For example, sexual desire activities are not directed towards the opposite sex, or the sexual organs of both men and women are not used to achieve sexual satisfaction.

1. Biological factors in the causes of bisexuality:

From an embryological developmental point of view, the early stages of fetal gonad structure tend to form female organs. It is only due to the action of the Y chromosome that the male gonads are caused. In the absence of fetal male hormone stimulation, the fetus will automatically develop female characteristics. To develop into a male, hormones must be used to change the developmental pattern. If the part of the developing brain that receives male information through hormones is different, the female component will remain in the male body. This not only explains why men with sexual identity disorder and sexual orientation disorder are much more common than women, but also explains why it can be seen from an early age whether they will develop into men or homosexuality. It can also explain why the sex hormone levels in the blood of adult male transsexuals and homosexuals are no different from those of normal men. That is, if certain key parts of the brain are not masculinized before birth, they will not respond to the testosterone already in the blood during childhood and adolescence. Female transsexuals have excessive secretion of male hormones, which is also formed in the critical period before birth; animal experiments show that females born as a result of receiving large amounts of male hormones during the embryonic period behave much like males, suggesting that sexual identity can be caused After birth, male hormones can only enhance the sexual ability of adult women and masculinize the body, but cannot change the sexual identity and sexual orientation of women.

Mild brain damage is also a biological factor. This damage mostly occurs before the age of 3, often due to birth trauma, encephalitis or meningitis, and can be supported by CT examination.

2. Psychological factors in the causes of bisexuality:

According to Freud, if the sexual and psychological development process encounters setbacks and goes astray, bisexuality may occur.

The mother's gaze on the baby, skin contact, gentle voice, and loving smile will establish a special relationship between the baby and the mother. The mother image occupies the baby's entire mind, and a feminine tendency will be established in the baby, whether it is a boy or a girl. This process is called "mother-child union", which actually occurs as early as the fetal period. Beginning, this is an identification process and a potential danger of gender identity disorder in boys. In addition, life and society's attitude towards children, such as parents dressing boys as girls according to their own preferences and treating boys as girls, will cause gender identity disorder in boys over time. On the contrary, if girls are treated like boys, girls will also Psychologically masculine.

3. Social factors in the causes of bisexuality:

Economic factors may play a role in bisexuality. For example, if a boy's family is poor and unable to marry a wife, or because of potential factors such as escaping male responsibilities, bisexuality may easily occur. Another example is a certain kind of society. Identity with bisexuality. During the Ming and Qing Dynasties in China, bisexuality was popular among the wealthy class, who often adopted "pedophiles". In the long history of China's feudal society, the relationship between maids and wives, and wives and husbands There are often different forms of bisexuality, which may also be an open secret; bisexuality is quite tolerated in some Western countries. In China it is still considered immoral and not allowed by law.

4. Gender differences in the causes of bisexuality:

There are also gender differences in the behavior of men and women among bisexual people. Among them, men are more likely to have homosexual acts with men they have never met before and then go their separate ways. And there are heterosexual behaviors along with homosexuality. Bisexual women tend to have sexual activities with close girlfriends, and their relationships are deep and long-lasting. They have sex only with the same sex or only with the opposite sex at a certain time, rather than with partners of two different sexes at the same time. Bisexual men often find a man to vent their feelings because they cannot find a suitable woman. This is not the case for bisexual women, who must first establish a relationship with their sexual partner before engaging in sexual activity.

This phenomenon does exist, but the reason should be attributed to personal choice, which is caused by many factors such as bisexual love values, social values, personal personality, etc., rather than simply determined by sexual orientation, giving people the wrong impression that bisexual men and women will do whatever they want. Stereotype.