Schlain states: "From an evolutionary point of view, homosexuality is a supreme paradox." If it had a genetic cause the trait would quickly go extinct. However, throughout history the rate of homosexuality has remained essentially constant, about 3% for males and 1% for females. It appears in all human societies.
The Proposed Root Cause
It is clear to me that our sexual attraction preferences are genetically carried. They are not learned after birth. However, our genes contain two distinctly different sexual attraction programs. One is for females insuring they are attracted to males, and the other is for males insuring they are attracted to females. Both options are available at conception. A selection is made during the development of the fetus. As Schlain states: "The female is the default mode for all mammalian fetuses". We all start out as females. At approximately six weeks after conception a male's budding testes will begin secreting large amounts of testosterone. This shifts the developmental sequence towards a male. When the testosterone secretion does not take place, all the fetuses even those with the male Y chromosome, will develop into females. This is the stage where the different developmental sequences between male and female are set in motion. Subsequent male and female features arise from common anatomic precursors that have the potential to develop into either sex. For example, the tissue destined to become the clitoris in the female will become a penis in a male. Since both options are genetically available, a selection process is taking place. This process selects which part of the genetic code will be expressed and which will be suppressed. Included in this are the genetically carried codes for sexual attraction. At the appropriate stage of development, the sexual attraction program is selected irreversibly. It is as irreversible as the selection between a clitoris and penis. It is not clear exactly what stage this particular selection happens. It is only clear that it does happen. This is the point where an error is made for homosexuals. The inappropriate program is selected.
At this point I revert to being a chemist. All developmental processes are chemical processes/reactions. The selection mechanism is a chemical process composed of a set of chemical reactions. Basically there is a chemical switch that is thrown and the program is selected.
As a chemist, I know that there is no such thing as a chemical reaction that has 100% yield of the preferred product. This is a fundamental prediction of thermodynamics. The yield is always less than 100%. Thus, when it is time for the chemical reactions to select the sexual attraction program, one would expect, from a simple chemical argument, that some fraction would not go the appropriate way. From the observations on the ongoing fraction of gay births, one would conclude that the reaction has about a 97% yield for males and a 99% yield for females. The remaining 3% males and 1% females are destined to be homosexual. Thus, homosexuality has a statistical, chemical yield cause. They are homosexual at birth but there is nothing unusual about their genetic makeup because it does not have a genetic cause. They can have the same fraction of normal children as non-gay people. As far as I know, I believe they do.
It is obviously absurd to judge homosexuals morally.
Is this particular form of perfection concept supportable? He had to believe it was a key factor in explaining his recognized, exceptional creative genius. Is it a reasonable premise in general? In support of this, Shlain presents a partial list of others: Socrates, Plato, Aristotle, Tchaikovsky, Newton, Milton, Michelangelo and Nietzche to name a few. We just have to look around us in our present society. On average, gays seem to possess exceptional aesthetic and creative abilities. They have made their mark not only in the arts and literature, but also in architecture, music, religion, science, mathematics and many other fields. Shlain states: "They fill a special niche in society and human culture would be considerably grayer and less sumptuous without them".