Up to this point, it is not possible to fully attribute the phenomenon of homosexuality to biological or psychological causes. According to the latest studies, many researchers have proved that the graph area on the brain of people of the 3rd gender has a certain difference compared to those of the male or female gender. Thus, biological causes have no small influence. However, it is the family environment, LGBT black cat be gay do crime shirt the care and education of parents and the interaction of the surrounding life which is also a factor that clearly affects the expression of homosexuality. Conduct genetic tests: Chromosome (survey the patient's chromosomal set with the standard 46XX for female, 46XY for male). The test determines blood levels of a variety of male and female hormones such as FSH, LH, oestradiol, progesterone, prolactin, and testosterone.