It doesn't because gay men don't screw women.
Do you have a link to back you up? I have known of homosexual men that have married heterosexual women and had children only for the woman to find out later and divorce them. You are so out of touch.
Artificial insemination is relatively new. There would have been no gays left to breed more
Just post some links.....we don't need baseless opinions.
What you have known is homosexual men who married and had children while they were heterosexual, which proves that homosexuality is choice/environmental rather than genetic.
One's chromosomes don't alter themselves randomly throughout life.
Post links? Why should that even enter your mind? Gay men have sex with men, not women. Exceptions? Yes, of course, but the chances of a genetically homosexual male having a child by a genetically lesbian female are so slim that the gene would be bred out of the species in under 10 generations.