Времена меняются...⁠⁠

Гены имеют к этому отношение весьма посредственное. Курите ту же самую вики, только желательно англоязычную и разные мнения. А ещё лучше - указанную там литературу.

"In 1993, Dr. Dean Hamer announced that he had found a correlation between DNA markers on the X chromosome (region Xq28) and sexual orientation in a selected group of homosexual men and their relatives over age eighteen. In other words, "it appears that Xq28 contains a gene that contributes to homosexual orientation in males." (Hamer, pp. 325) In his book, Dr. Hamer stated, "We can make only educated guesses about the importance of Xq28 in the population at large." He concludes that "Xq28 plays some role in about 5 to 30 percent of gay men. The broad range of these estimates is proof that much more work remains to be done." (Hamer and Copeland, pp. 145–46) Scientists have since questioned the validity of these findings and what they purport to show. (Scientific American 1994, pp. 50–55) Dr. Hammer has been charged with research improprieties and is under investigation by the federal government for improperly excluding from his study men whose genetic makeup contradicted his findings. (Scientific American 1995, p. 26) A later study by the University of Western Ontario "found no consistent pattern of DNA similarity on the X chromosome." (Washington Post, pp. 5–6)"

Источник: http://www.samesexattraction.org/biological-causes-homosexua...