4. Homosexuality is NOT, and CANNOT be a "normal variation." It is prohibited by natural selection.

It's "normal" it that it appears to occur at comparable rates (as a percentage) across the spectrum of species who engage in sexual behavior; indeed, among humans, it occurs at the same rates in nations like Saudi Arabia and Iran, where it can be punishable by caning and even beheading, as in more "liberal" nations like Britain, France, and even the U.S.