We know that the common genders of people are male and female, but very often it is difficult to distinguish a person from a male or female by appearance, in fact, the identification of human gender is much more than just appearance so simple. There are six methods most commonly used to identify a person’s gender. 1.Social gender That is, as a member of society, his or her phenotype appears to be male or female, is the outsider’s identification of his or her gender. Due to the development of modern society, the change of concept, the change of labor methods, the change of social division of labor, people dress more and more neutral, many occasions you may not really be able to distinguish a person’s male and female attributes. 2, chromosome gender We know that the male karyotype is 46,xy and the female is 46,xx, most people think this is the best way to distinguish between the sexes. But there are exceptions, there are big old men whose chromosomes are 46,xx, so you admire it! But although they have a male appearance, can also marry a wife to live a normal sex life, but generally will not have sperm, difficult to have the next generation. 3, genetic gender Genetic gender is actually said to be the gender determinant on the Y chromosome, mainly refers to SRY, located on the Y chromosome, is the determining factor in determining the differentiation of the original gonads to the male. Those with SRY are male, those without are female. However, there are exceptions. If during sperm division, SRY, which should have been on the Y chromosome, runs to the X chromosome or autosomes, there will be a 46,xx male. 4, external genitalia gender If there are male external genitalia such as penis, scrotum, testicles, etc. is male, if there are female external genitalia such as labia, clitoris, vagina, etc. is female. But some people have two sets of male and female external genitalia, making it difficult for you to identify male and female. 5.Gonadal gender Those with testicles are male, those with ovaries are female, sometimes we need ultrasound to help us find out. 6.Psychological gender refers to your own identification of your own gender attributes. Psychological gender is influenced by a variety of factors such as family, society, friends, and upbringing, and is often misaligned. A lot of men in female form, women in male form, and even transgender, are caused by psychological gender misalignment. There are also some other methods of identification, these six are the most commonly used.