Now it is no secret to anyone that homosexuality in men is a universal phenomenon. A number of countries have already legalized same-sex marriage, while others still continue to ban them. Scientists who are struggling with the causes of homosexuality, once again tried to solve the mystery of this natural phenomenon.
Until recently, there was no exact information about why men have homosexuality. To find out it took a large-scale study, which was attended by gay men.
A total of 409 homosexual couples were examined. Participants in the experiment donated DNA samples: blood and saliva. It turned out that two genes are responsible for the propensity for same-sex love, one of which is located in the "female" X chromosome, and the second - in the eighth chromosome of the DNA chain.
