Seth and his two male cousins are homosexual.The two cousins are on his mother's side of the family,as would be predicted by a genetic explanation for homosexuality,called

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The fertile female theory suggests that the same genetic factors that promote homosexuality in males may also increase fecundity (reproductive success) in the female relatives of those males, thus explaining the presence of homosexuality in families from a genetic perspective.

Seth and His Two Male Cousins Are Homosexual