A man who carries a small dose of gay genes in his genome would, according to the theory, improve his success in the heterosexual mating game. That “certain something” that heightens sex appeal probably consist exactly of those essentials which make homosexuals different from heterosexuals in the first place. According to his theory, the alleged “gay genes” equip men who carry the heterozygous disposition with an above-average degree of feminine traits such as sensitivity, gentleness and friendliness. Gay genes therefore form a natural antidote against “hypermasculine” genes that turn men into rough machos. They would promote properties that appeal to women and indicate a good suitability as a father and significant other. A lesbian disposition lends women reversed traits that helps their reproductive success. Surveys have already shown that psychologically “masculine” women have more sex contacts.
Imagine, for example, there were five genes, each of which occurs in duplicate and increases the probability of homosexuality, Miller speculates. Only if a man had all five alleles in duplicate, he would be gay. “That would be an event that occurs with a probability of 1 to 32, meaning in 3 percent of all men.” Such a system would already be evolutionary stable if a hint of homosexual disposition would increase the genetic fitness of heterosexuals by only 2 percent.
Whether it’s right or not it does seem to make sense.