One recent theory of male homosexuality involves genes that are expressed differently in males and females, so that the males with the gene, which increases male attraction, become homosexual, while the females with the gene become heterosexual.This type of gene transmission is called

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Sexually antagonistic selection occurs when a gene has opposite effects on fitness in males and females. In this theory, the gene that contributes to male homosexuality would increase fitness in females by increasing attraction to males, but decrease fitness in males by causing homosexuality. This type of selection could lead to the maintenance of the gene in the population despite its negative effect on male fitness. Polynomial causation, horizontal gene transfer, and extranuclear inheritance are not relevant to this theory.

One Recent Theory of Male Homosexuality Involves Genes That Are