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RE: If they could find a ‘gay gene’ I guarantee you it would be required teaching to all high school freshman (or third graders.)

Writer Philip Irvine made this observation:

http://www.wnd.com/2012/10/why-you-cant-be-born-gay/

The laws of evolution and of genetic succession are particularly harsh on any trait that prevents reproduction, so let’s start with a simple formula that paints a stark picture: “One gay man + one gay man = zero gay children.”

Or we can look at the female side of the picture: You can go back maybe 10 generations and assume any fertility rates (number of children per woman) for lesbian and straight women and calculate what would happen. Even a slight difference would cause a homosexual gene to rapidly fade from the population.

On the other hand, if the fertility rates were the same, how could women be considered lesbians if they were having the same amount of heterosexual sex to produce an equivalent number of children?

Even if a tendency toward homosexuality were genetic, every time that gene expressed itself, it would fall out of the gene pool. Ask any genetics teacher, “Could homosexuality be genetic if there is no mechanism for gays to pass their genes on to children as frequently as straights pass genes on to their children?” While you are at it, propose any percentage of gays in the starting population and any fertility rates for gays and straights, and ask for the mathematical calculations of how rapidly a homosexual gene would die out.